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.

Turkey’s foreign minister is set to travel to Russia on Monday to discuss the situation in Ukraine, following direct talks earlier this month in Istanbul between the two sides in conflict.

The first direct peace talks between Russia and Ukraine in more than three years lasted well under two hours, with no apparent sign of progress so far in narrowing the gap between the sides, and a Ukrainian source called Moscow's demands "non-starters".