When Russian President Vladimir Putin arrived in Beijing on Tuesday evening for a two-day state visit, he once again returned to his “second home” at the Diaoyutai State Guesthouse, a royal garden that has hosted dignitaries including Richard Nixon, Boris Yeltsin and Kim Jong-un. Diaoyutai is a familiar setting for Putin, who has visited China more than 20 times and personally met President Xi Jinping on more than 40 occasions since 2013, according to state news agency Xinhua. He usually resides...