US ambassador to Japan Rahm Emannuel boycotted a ceremony marking the 79th anniversary of the Nagasaki bombing.
North Korea has been expanding its short-range weaponry designed to overwhelm missile defences in South Korea.
Russian leader threatens to relaunch production of intermediate-range nuclear weapons if US deploys missiles to Germany.
Taiwan’s 40th edition of its Han Kuang war games tests the island’s readiness to repel a potential Chinese invasion.