The Japanese Self Defense force rarely mentions the operations of their submarines, short of participating in an exercise with the United States.
But in a recent announcement by the Japanese, they highlighted that the Kuroshio, the helicopter carrier Kaga and two other destroyers, the Inazuma and Suzutsuki, conducted an antisubmarine warfare exercise last Thursday in the waterway.
Mr. Michishita called it “very significant” that Japan was practicing its anti-submarine warfare capability because China operates nuclear-powered submarines that can fire ballistic missiles.
The exercise followed operations in the region by British and French forces and repeated moves by the U.S. Navy to reinforce freedom of navigation in the South China Sea.
By visiting Vietnam, the Japanese submarine also highlighted the cooperation that the U.S. and its allies have been building with Hanoi, which contests China’s claims to some South China Sea territory.