China has swooped. After watching the war with great interest for 14 months, and repeatedly demonstrating support and friendship for Russia's Vladimir Putin, China's President Xi Jinping has made his move. It was a magnificent sunny spring morning in Ukraine's capital, Kyiv, on April 26 when Xi deigned to speak to Ukrainian President Volodymyr Zelenskyy. Since the war began 15 months ago, Xi has remained one of the few major world leaders not to have bothered to have a conversation with Zelenskyy, whose country is fighting to survive under attack from Russia. Instead, he has engaged in photo opportunities with...