Ukraine’s President Volodymyr Zelensky raised the stakes ahead of a potential meeting with Vladimir Putin in Turkey by saying he wouldn’t hold talks with any Russian representative other than the president himself.

The talks took place in the warring capitals of Moscow and Kyiv, from Washington and Riyadh, Saudi Arabia, to countries across Europe.

Ukraine and Russia are expected to hold their first direct peace talks since the weeks following Moscow’s full-scale invasion three years ago, but little is known aside from the date and the place: May 15 in Istanbul.