Why is so-called South China Sea arbitration ruling illegal?

①China has rejected a joint statement by several countries marking the 10th anniversary of the so-called South China Sea arbitration ruling. Why is the ruling illegal and invalid? (00:59) ②Ukrainian Prime Minister Yulia Svyrydenko has stepped down as President Volodymyr Zelensky announced fresh changes to Ukraine's government. What specific strategic shift is Zelensky signaling? (24:58) ③The IMF has downgraded the global growth outlook, but why has it upgraded China's growth forecast? (34:56) ④Hainan has reaffirmed its plan to ban the sale of gasoline-powered vehicles by 2030 and become the first province in China to do so. How ambitious is the goal? (46:52)