evidence: Vladimir Putin and Xi Jinping: An increasingly unequal relationship [...] In their meeting, Mr Putin conceded that China has "questions and concerns" about the situation in Ukraine. It was an unexpected admission, by the Kremlin, that Russia's so-called special military operation is causing some anxiety in Beijing. [...] The summit Mr Putin and Mr Xi are attending is a meeting of the Shanghai Cooperation Organisation, or SCO. Along with Russia and China, members include four Central Asian states - Kazakhstan, Uzbekistan, Kyrgyzstan and Tajikistan - as well as India and Pakistan.