Chinese nationalists are calling for Russia to return land they claim was stolen by the Kremlin in the 19th century. A video on Chinese social media has called on Beijing to take advantage of Moscow's weakened position to seize large parts of Siberia and Russia's Far East. The clip has gone viral in China and has racked up millions of hits among viewers on TikTok. -snip- The Treaty of Aigun in 1858 forced China to cede much of Manchuria to the Russian Tsar Alexander II. The territory, comprising some 600,000 square kilometres, is part of Russia's Far East and includes...