US President Joe Biden, Chinese President Xi Jinping and other world leaders are to attend the two-day summit in Bali that starts November 15. Biden, who has called Putin a "war criminal” would have come face to face for the first time with Putin since Russia invaded Ukraine in February. "I can confirm that (foreign minister) Sergei Lavrov will lead the Russian delegation to the G20. President Putin's program is still being worked out, he could participate virtually," said Yulia Tomskaya, the embassy's chief of protocol.