Russian warships held drills as part of one of the largest Russian military exercises in 40 years, since the height of the Soviet Union.
The Vostok-2018 drills, held around the Bering Sea separating Russia and Alaska, have 300,000 troops, more than 1,000 military aircraft and two naval fleets involved.
With tensions between Russian and the west running high, NATO and the US have both announced they will be watching the exercises closely.
A retired Russian general claimed the war games were a response to US and Western nations putting pressure on Russia.
“The manoeuvrers are aimed at deterring the aggressive intentions of the US and NATO,” retired General Leonid Ivashov said.
Russian President Vladimir Putin attended the drills on Thursday, delivering a speech saying Russia is a peaceful country and ready to cooperate.
He also said he will strengthen the Russian army with modern weapons and equipment, and that it is a soldier’s duty to defend his country and allies.
China is also participating in the large-scale war games, with thousands of troops taking part.