The U.S. Navy carrier, the USS Ronald Reagan, conducted three days of drills with a Japanese destroyer and two Indian warships in the Sea of Japan, Japan’s navy said on Tuesday.

The exercise involving five ships, which ended Monday, came amid heightened tension in the region over North Korea’s ballistic missile and nuclear tests and as U.S. President Donald Trump began a 12-day tour of Asia beginning in Japan on Sunday.

“The exercise helped improve fighting skills and deepened cooperation with India,” Japan’s Maritime Self Defence Force said in a press release.

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