North Korean leader Kim Jong Un arrives for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY - RTX35CE1

North Korean leader Kim Jong Un waves to people cheering during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY - RTX35CEL

Soldiers cheer as North Korean leader Kim Jong Un arrives for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CMO

North Korean soldiers stand guard before an opening ceremony for newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CNV

People react as a vehicle carrying foreign reporters passes towards the newly constructed residential complex before its opening in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35COV

Men in uniforms walk between buildings after the opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CQ5

Soldiers march through the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CRJ

People visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CS3

North Korean soldiers stand behind flags before an opening ceremony for a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

Soldiers visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean leader Kim Jong Un arrives for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CE7

North Korean leader Kim Jong Un, accompanied by country's high ranking military and government officials, waves to people cheering during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CFO

People check newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CNS

Men wait for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35COM

People stand in front of a board showing details about newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CPA

People are seen through a red flag as they walk through a newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CQM

People carry flags after an opening ceremony for the newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CR7

People walk between buildings after the opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CRO

North Korean soldiers march as they visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

People walk between buildings after the opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean leader Kim Jong Un is accompanied by country's high ranking military and government officials as they attend an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean leader Kim Jong Un attends an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CEM

Men wearing uniforms check a newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY - RTX35CN9

People look towards the stage where North Korean leader Kim Jong Un cut the ribbon during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CO3

People visit newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35COW

People react as a vehicle carrying foreign reporters passes towards the newly constructed residential complex before its opening in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CQU

Soldiers visit newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CRN

A propaganda banner hangs from a building at a newly constructed residential complex as people visit it after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

Soldiers visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

A North Korean soldier smiles as thousands visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean leader Kim Jong Un, accompanied by the country's high ranking military and government officials, claps hands after cutting the ribbon during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CEF

North Korean leader Kim Jong Un cuts the ribbon during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CFW

North Korean soldiers march between buildings after an opening ceremony for newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CNU

Thousands of people arrive for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CON

People cheer towards the stage where North Korean leader Kim Jong Un cut the ribbon during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CQ2

People check the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CR8

People check shoes in a shop in a newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CS5

Soldiers visit newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

A man carries flags after an opening ceremony for the newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean leader Kim Jong Un cuts the ribbon during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CE8

North Korean leader Kim Jong Un, accompanied by the country's high ranking military and government officials, waves to people cheering during an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CEX

A North Korean soldier checks flags before the opening ceremony for the newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35COF

North Korean military officers arrive for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CPU

A man looks at a board showing information about the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CR6

Soldiers visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CS4

Thousands of people arrive for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

Women wearing traditional clothes walk past North Korean soldiers after an opening ceremony for a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. Image for illustrative purpose.

People walk between buildings after the opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY - RTX35CMM

North Korean soldiers march after an opening ceremony for newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CNN

A North Korean soldier walks on the road in the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY - RTX35COE

A vendor is pictured in a shop in newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CPQ

Women wearing traditional dresses walk through a newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CQY

Men wait for an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj - RTX35CRZ

North Korean soldiers visit newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

North Korean soldiers carry flags as they visit the newly constructed residential complex after its opening ceremony in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj

Kim Yo Jong, sister of North Korean leader Kim Jong Un, attends an opening ceremony of a newly constructed residential complex in Ryomyong street in Pyongyang, North Korea April 13, 2017. REUTERS/Damir Sagolj