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

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.

Both Moscow and Kyiv each accused the other of violating a truce Ukraine had never agreed to — even as it prompted Ukraine, with backing from European leaders (France, Germany, the United Kingdom and Poland) and the United States (it seems), to demand an extended 30-day ceasefire from the Kremlin.