A Russian Armata T-15 mechanized infantry combat vehicle is on display during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Participants attend the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

A Russian Tornado-G multiple rocket launcher fires during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A woman poses for a photo next to statues depicting Russian servicemen during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 22, 2018.

Russian MSTA-S self-propelled howitzers fire during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

Russian servicemen walk during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A Russian serviceman on a BMP-3 infantry fighting vehicle attends the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A participant holds a rifle during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018. REUTERS/Maxim Shemetov

(L-R, front) Russia's Deputy Prime Minister Yuri Borisov, Special Presidential Representative for Environmental Protection, Ecology and Transport Sergei Ivanov and Defence Minister Sergei Shoigu attend the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Russian servicemen walk during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A Russian T-80 U tank drives during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A Russian 2K22 Tunguska anti-aircraft vehicle fires during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

Russia's Defence Minister Sergei Shoigu (C) attends the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Russia's President Vladimir Putin addresses participants via a video link during the opening of the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Russian servicemen stand atop armoured vehicles during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

An AK-308 rifle is on display during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Military vehicles and cannons are on display during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Russian T-80 U tanks perform during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

Russian armoured vehicles take part in the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

Russian servicemen work during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

Russia's Defence Minister Sergei Shoigu delivers a speech during the annual international military-technical forum "ARMY" at Patriot Expocentre in Moscow Region, Russia August 21, 2018.

A Russian TOS-1A Solntsepek multiple rocket launcher fires during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

A Russian TOS-1A Solntsepek multiple rocket launcher drives during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.

Officers of the Russian National Guard stand next to armoured vehicles during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018.