Russia began its biggest war games since the fall of the Soviet Union on Tuesday close to its border with China, mobilizing 300,000 troops in a show of force that will include joint exercises with the Chinese army.
China and Russia have staged joint drills before but not on such a large scale, and the Vostok-2018 (East-2018) exercise signals closer military ties as well as sending an unspoken reminder to Beijing that Moscow is able and ready to defend its sparsely populated far east.
Vostok-2018 is taking place at a time of heightened tension between the West and Russia, and NATO has said it will monitor the exercise closely, as will the United States which has a strong military presence in the Asia-Pacific region.