Abstract: Since the collapse of Russia’s relationship with the West over Ukraine, the Sino-Russian strategic partnership has become more of a reality. Russia and China share a common desire to challenge principles of the Western-dominated international system. But their relationship is complex, with lingering mistrust on both sides. The balance of competition and cooperation is most evident in Central Asia, the Russian Far East, and the Arctic. Engagement in these theaters has tested Russia’s and China’s abilities to manage their differences and translate the rhetoric of partnership into tangible gains.