Russia's Defence Ministry says Moscow has test-fired anti-ship missiles in the Sea of Japan's Peter the Great Gulf.
The ministry said on Tuesday that two navy boats launched a simulated missile attack on a mock enemy warship about 100 kilometres away.
The ministry said the target was successfully hit by two Moskit cruise missiles.
The Moskit, referred to by NATO as the SS-N-22 Sunburn, is a supersonic anti-ship cruise missile that has conventional and nuclear warhead capacity.
The Soviet-built cruise missile is capable of flying at three times the speed of sound and has a range of up to 250 kilometres.
Russia said the exercise, which included other warships and naval aircraft, took place in the Peter the Great Gulf in the Sea of Japan but did not give more precise coordinates.
The Peter the Great Gulf borders the Russian Pacific Fleet headquarters at Fokino and is about 700km from Japan's northern Hokkaido Island.
The US Navy's 7th Fleet did not immediately respond to requests for comment.
Japan reacted calmly to the missile exercise, which was conducted near Vladivostok, rather than directly into the waters between the two countries.
Tokyo does not plan to lodge a protest to Russia over the missile exercise, said Tasuku Matsuki, Japanese Foreign Ministry official in charge of Russia, noting that its location — Peter the Great Bay — is considered Russian coast, though it is facing the water between the two countries.
"On the whole, Japan is concerned about Russia's increasing military activities around the Japanese coasts and watching them with great interest," Mr Matsuki said.
He said Russia has conducted missile drills in that area in the past and issued maritime advisories ahead of time.
He said Japan was not in a position to comment on Russia's intention for the exercise.
Russian nuclear-capable Tu-95 bombers flew over the Sea of Japan for several hours last week.
In September, Japan protested against multinational military exercises on the Russian-held Kuril Islands — some of which are claimed by Japan — and expressed concern about Russian and Chinese warships conducting shooting drills in the Sea of Japan.
Russia also tested submarine-launched missiles in the Sea of Japan last year.
AP
