The Ukrainian leader tweeted that Xi Jinping had made a call to Ukraine President Volodymyr Zelensky for the first time after Russia invaded Ukraine. Zelensky described the conversation as “long and meaningful”, and added that it, together with the appointment to China of Ukraine’s Ambassador, “will give an important impetus to our bilateral relations”. Chinese television reported the call. China has tried to portray itself as a mediating force in the Russia-Ukraine dispute, while simultaneously praising its increasingly close relationship with Russian President Vladimir…