The latest launch came after the South Korean and US militaries began mainly computer-simulated joint exercises on Monday to test Seoul's ability to take operational control in wartime.
A US carrier group led by the USS Theodore Roosevelt entered the South China Sea on Saturday to promote “freedom of the seas,” the US military said, days after Joe Biden began his term as president.
The agency did not say when the exercises would be held or what type of forces would be involved but it placed an area off the coast of Guangdong and Fujian provinces,
US Defense Secretary Mark Esper said on Thursday he does not regret postponing a US-South Korean military exercise, even though the gesture was rejected by North Korea
Speaking during a visit to Bangladesh, Chinese Foreign Minister Wang Yi said his country's actions were "legitimate, reasonable, in accordance with the law," and aimed at protecting China's "sacred sovereignty."
The drills could draw an angry response from North Korea, which has dialed up its weapons testing activity to a record pace this year while repeatedly threatening conflicts with Seoul and Washington amid a prolonged stalemate in diplomacy.
Russia's Eastern Military District said it was conducting military drills on the Kuril islands with more than 3,000 troops and hundreds of pieces of army equipment, Russia's Interfax news agency said Friday.
Russia's joint Allied Resolve drills, which NATO has described as its biggest deployment to ex-Soviet Belarus since the Cold War, run until Feb. 20 and are seen as part of Russian deployments near Ukraine that have stirred fears of an invasion.
The missiles fly at nine times the speed of sound, with a range of more than 1,000 km (620 miles), Russia says. They form the centrepiece of its hypersonic arsenal, along with the Avangard glide vehicle that entered combat duty in 2019.