Next week, a Turkish delegation will fly to the Russian capital for technical discussions ahead of a planned meeting of the foreign ministers of Turkey, Russia, Iran, and Syria.
U.S. President Joe Biden will meet leaders of NATO's eastern flank on Wednesday to show support for their security after Moscow suspended a landmark nuclear arms control treaty.
Russia said on Wednesday it had broken through two fortified Ukrainian defence lines on the eastern front, with Kyiv describing conditions there as difficult and Western allies announcing more military aid including artillery rounds.
In a blatant indication that the confrontation with Russia is likely to intensify in the coming months, the U.S. and other NATO states will provide Ukraine with a comprehensive shipment of heavy weapons.