Russian and Ukrainian negotiators will meet in Istanbul on Wednesday evening for their first peace talks in more than seven weeks, with Moscow under pressure from U.S. President Donald Trump to strike a deal or face tough new sanctions.

Officials from Russia and Ukraine ended a third round of formal negotiations in Istanbul with an agreement to swap more prisoners but little sign of progress on a deal to halt the war.

The two sides agreed to have a prisoner exchange of 1,200 people, National Security and Defense Council Secretary Rustem Umerov said.