Russia and China have begun a series of mock combat drills in the Sea of Japan to highlight the two powers' tight military ties.

U.S. President Donald Trump says he has ordered two nuclear submarines to move closer to Russia in response to social media comments by former Russian president Dmitry Medvedev about the risk of war between the nuclear-armed adversaries.

A volcano on Russia's eastern Kamchatka Peninsula erupted overnight into Sunday for what scientists said is the first time in hundreds of years, days after a massive 8.8-magnitude earthquake.

More than 120 firefighters were trying to extinguish a blaze at an oil depot in the Russian city of Sochi that was sparked by a Ukrainian drone attack, regional Governor Veniamin Kondratyev said early on Sunday on the Telegram messaging app.

Ukraine’s military said on Saturday that it had struck oil facilities inside Russia, including a major refinery as well as a military airfield for drones and an electronics factory. In a statement on Telegram,