The Trump administration has invited Russian President Vladimir Putin to the Dec. 14-15 G20 summit at Trump National Doral Miami, where Secretary of State Marco Rubio said Putin could engage with President Donald Trump and other world leaders. Polish Prime Minister Donald Tusk warned that the invitation could encourage Moscow to continue its aggression against Ukraine, although he said he would support it if it brought the sides closer to a just peace. The Kremlin said Russia would consider the invitation through diplomatic channels, while no attendance or Trump-Putin meeting has been confirmed. The development comes as diplomatic efforts to end Russia's war in Ukraine remain stalled and amid debate over potential sanctions against Moscow.