A Russian warplane flew within 50 feet of a US surveillance aircraft in Asia last week.

The US P-8 Maritime Patrol reconnaissance was conducting a routine mission in international airspace near the Kamchatka Peninsula on April 21.

But during the exercise, it was intercepted by an MiG-31 Russian jet - a supersonic jet, which is one of the fastest combat planes in the world.

It came just days after a Russian Su-27 barrel-rolled over an American RC-135 reconnaissance plane near the Baltic Sea on April 14 - a move deemed 'unsafe' by the Pentagon.

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The US P-8 Maritime Patrol reconnaissance, was conducting a routine mission in international airspace near the Kamchatka Peninsula on April 21 when it was intercepted by an MiG-31 Russian jet (file image pictured)

The Russian jet began its course on the left side of the American reconnaissance plane, then went over it while spiraling on itself and finished on the right side.

And on April 11, the Pentagon slammed Russia after two Su-24 aircraft came within feet of the USS Donald Cook, a missile destroyer.

Secretary of State John Kerry said the Navy ship could have opened fire on the Russian military jets that buzzed around it.

The altercations come as Russia increases its patrol of borders using attack submarines.

Russia has hit back at the US, accusing American military of intimidation by sailing the naval destroyer close to Russia's border in the Baltics.

Kremlin officials warned that the Russian military would respond with 'all necessary measures' to any future incidents.

Speaking after a meeting between NATO envoys and Russia, their first in almost two years, Moscow's ambassador to NATO said the April 11 maritime incident showed there could be no improvement in ties until the US-led alliance withdrew from Russia's borders.

'This is about attempts to exercise military pressure on Russia,' the envoy, Alexander Grushko, said.

'We will take all necessary measures, precautions, to compensate for these attempts to use military force.'

On Thursday, a Pentagon spokesman downplayed the latest set-to.

Cmdr. Dave Benham, of the Pacific Command, told the Washington Free Beacon the move by the Russian jets was 'safe and professional' compared to the other incidents.

He added: 'Intercepts between the United States and other militaries occur often and the vast majority are professional.