Japan said Friday that it would strengthen intelligence-gathering and monitoring after the Russian Defense Ministry announced a day earlier that two navy submarines had test-fired Kalibr cruise missiles in the Sea of Japan, the latest in a series of high-profile military exercises in the region since Moscow’s invasion of Ukraine.

“In recent years, Russian military activities, including the deployment of state-of-the-art equipment and training exercises, have tended to increase in the vicinity of Japan,” Defense Minister Nobuo Kishi told a news conference. “We will continue to collect information and conduct vigilant monitoring with a sense of concern.”

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