Ukraine’s President Volodymyr Zelensky might meet Russia’s President Vladimir Putin in Turkey on Thursday – if the Russian leader decides to show up for a summit that he himself suggested.

U.S. Secretary of State Marco Rubio and his NATO counterparts meet in Turkey to prepare a pivotal summit of alliance leaders next month that will set the course for future European security as America focuses on challenges elsewhere.

The Russian president had been challenged by Ukraine's Volodymyr Zelensky to meet in person at the talks on Thursday.