Japan's Prime Minister Shinzo Abe takes off his face mask as he arrives to speak to the media on Japan's response to the coronavirus disease (COVID-19) outbreak, at his official residence in Tokyo, Japan, April 6, 2020. Image used for illustrative purpose.

U.S. President Donald Trump meets with Japan's Prime Minister Shinzo Abe in the Oval Office at the White House in Washington, U.S., April 26, 2019.

Prime Minister of Japan Shinzo Abe is seen on stage. REUTERS/Stoyan Nenov

Japan's Prime Minister Shinzo Abe, who is also leader of the ruling Liberal Democratic Party (LDP), eats a local grilled fish during his official campaign kick-off for the December 14 lower house election, at the Soma Haragama fishing port in Soma, Fukushima prefecture, December 2, 2014. REUTERS/Issei Kato

China's President Xi Jinping (R) shakes hands with Japan's Prime Minister Shinzo Abe during their meeting at the Great Hall of the People, on the sidelines of the Asia Pacific Economic Cooperation (APEC) meetings, in Beijing November 10, 2014. Xi and Abe held formal talks on Monday for the first time since the two leaders took office, a breakthrough in ending a two-year row between Asia's biggest economies over history and territory. REUTERS/Kim Kyung-Hoon

Japan's Prime Minister Shinzo Abe (L) looks at China's President Xi Jinping during a welcoming ceremony of the Asia Pacific Economic Cooperation (APEC) forum, inside the International Convention Center at Yanqi Lake, in Beijing, November 11, 2014.

Japan's Prime Minister and leader of the ruling Liberal Democratic Party (LDP) Shinzo Abe speaks to voters on the last day of campaigning for the July 10 upper house election in Tokyo, Japan July 9, 2016.

Indian Prime Minister Narendra Modi (R) and Japan's Prime Minister Shinzo Abe pose in front of a Shinkansen bullet train before heading for Hyogo prefecture at Tokyo Station, Japan November 12, 2016, in this photo taken by Kyodo. Mandatory credit Kyodo/via REUTERS

Japan's Prime Minister Shinzo Abe wearing a protective face mask arrives at his official residence, amid the coronavirus disease (COVID-19) outbreak, in Tokyo, Japan August 28, 2020.

Japanese Prime Minister Shinzo Abe (L) talks with U.S. President Barack Obama during a meeting at Camp H.M. Smith in Aiea, Hawaii, U.S., December 27, 2016.

Japanese Prime Minister Shinzo Abe bows during a news conference at the prime minister's official residence in Tokyo, Japan, August 28, 2020. Franck Robichon/Pool via REUTERS

Japan's Prime Minister Shinzo Abe (C) raises his fist with members of the ruling Liberal Democratic Party (LDP) holding Daruma dolls, which are believed to bring good luck, during the annual party convention in Tokyo March 8, 2015.

Myanmar State Counselor Aung San Suu Kyi (C), accompanied by Japan's Prime Minister Shinzo Abe, reviews a guard of honor before their meeting at the state guest house in Tokyo, Japan November 2, 2016.

Japan's Prime Minister Shinzo Abe (front) walks past China's President Xi Jinping during a welcoming ceremony of Asia Pacific Economic Cooperation (APEC) forum, inside the International Convention Center at Yanqi Lake, in Beijing, November 11, 2014.

Cuba's former President Fidel Castro (R) and Japan's Prime Minister Shinzo Abe (L) meet in Havana, Cuba, September 22, 2016, in this handout photo provided by Cubadebate. Alex Castro/Cubadebate/Handout via Reuters

Japanese Prime Minister Shinzo Abe reacts during a news conference at the prime minister's official residence in Tokyo, Japan, August 28, 2020. Franck Robichon/Pool via REUTERS

Japan's Prime Minister and leader of the ruling Liberal Democratic Party (LDP) Shinzo Abe speaks to supporters at an election rally on the last day of campaigning for the Dec. 14 lower house election in Tokyo December 13, 2014.

2016 Rio Olympics - Closing ceremony - Maracana - Rio de Janeiro, Brazil - 21/08/2016. Japanese Prime Minister Shinzo Abe takes part in the closing ceremony. REUTERS/Stoyan Nenov

U.S. President Donald Trump talks with Japanese Prime Minister Shinzo Abe during a couples dinner with first lady Melania Trump and Abe's wife Akie in Tokyo, Japan May 26, 2019. Kiyoshi Ota/Pool via Reuters

Japan's Prime Minister Shinzo Abe (2nd R), and the leader of the ruling Liberal Democratic Party, speaks to voters atop a van during a campaigning for the July 21 Upper house election in Tokyo July 20, 2013.

Russian President Vladimir Putin (L) and Japanese Prime minister Shinzo Abe shake hands at Japanese-Russian business dialogue meeting in Tokyo, Japan, December 16, 2016.

Japan's Prime Minister Shinzo Abe raises his fist with his party's lawmakers at the party lawmakers' meeting after the dissolution of the lower house was announced at the Parliament in Tokyo November 21, 2014.

Japan's Prime Minister Shinzo Abe (L) shakes hands with China's President Xi Jinping during a meeting in Beijing, China in this photo taken by Kyodo October 26, 2018. Picture taken on October 26, 2018. Kyodo via REUTERS

Japan's Prime Minister Shinzo Abe, and the leader of the ruling Liberal Democratic Party (LDP), smiles as he puts a rosette on a name of a candidate, who is expected to win, at the LDP headquarters in Tokyo July 21, 2013.

U.S. President Donald Trump and Japanese Prime Minister Shinzo Abe onboard the Japan's navy ship Kaga on May 28, 2019 in Yokosuka, Japan. Charly Triballeau/Pool via REUTERS