Russia says it caught a U.S. Navy ship illegally operating in Russian waters in the Sea of Japan and “chased off” the offending ship on Tuesday.

The area in question has been claimed by Russia as part of its territorial waters since 1984, but the U.S. does not recognize that claim.

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The Admiral Vinogradov, a Russian destroyer, verbally warned the USS John S. McCain that it would be rammed if it didn’t leave the area after it violated the boundary by more than a mile, according to Russia’s Defense Ministry. The McCain, an Arleigh-Burke class destroyer, immediately returned to neutral waters after the warning, according to the Kremlin.

However, the U.S. is telling a different story. It says that the McCain “asserted navigational rights and freedoms in the vicinity of Peter the Great Bay in the Sea of Japan.”

Read more at NPR.