Peace in Ukraine remains as elusive as when Russian tanks first streamed across its borders more than three years ago. This week’s talks in Istanbul—talks that Vladimir Putin himself proposed—show he isn’t yet ready to do a deal.

Ukrainian President Volodymyr Zelenskyy called on Saturday for stronger sanctions on Moscow after a Russian drone killed nine bus passengers in northeastern Ukraine just hours after the two countries held their first peace talks in three years of war.

The first peace talks in three years were supposed to begin on Thursday but amid posturing and accusations, they were pushed back at least until Friday.