Amid rising tensions with the West, Russia has said it has driven a US submarine out of its territorial waters in the Pacific.
The destroyer "Marshal Shaposhnikov" has tracked down a US submarine in Russian waters near the Kuril Islands, the Defense Ministry said in Moscow on Saturday.
After the submarine ignored requests to heave to, the Russian destroyer "took appropriate action," it said without further explanation.
The submarine then left Russian waters "at top speed".
At the time, exercises by the Russian Navy were planned near the island of Urup, which belongs to Russia.
The American military attaché was later summoned to the Defense Ministry in Moscow and given a protest note.
The incident happened against the background of high tensions between the US and Russia over the Ukraine crisis.
According to Western sources, Russia has massed more than 100,000 soldiers on the Ukrainian border in recent weeks.
The troop build-up and Russian military exercises in neighboring Belarus and in the Black Sea are fueling fears in the West of an invasion of Ukraine.
Moscow rejects any plans of attack and at the same time accuses Kiev and NATO of "provocations".
Diplomatic efforts to resolve the crisis at the highest level continued on Saturday.
US President Joe Biden spoke to Russian President Vladimir Putin on the phone.
The conversation lasted about an hour, the White House said afterwards in Washington.
Details of the content of the call would follow later.
French President Macron also spoke to Putin on Saturday and called on the Russian President to comply with the Minsk Agreement.