The announcement appears to preclude any kind of top-level meeting or breakthrough ahead of the 50-day deadline for an agreement given by President Donald Trump.

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

Ukraine, Russia hold third round of peace talks in Istanbul * Ukrainian drones reportedly target key logistics hub in southwestern Russia * Russia suffered 80,000 casualties during Kursk incursion, Ukraine's military chief says * 'He sees Trump as emotional and susceptible to influence' — Putin not worried about 50-day ceasefire deadline,