Peace talks between Russia and Ukraine ended without a breakthrough on Monday.
"We are travelling back to the capitals for consultations," Ukrainian presidential advisor Mykhailo Podolyak told reporters as he left the meeting on the Belarus-Ukraine border.
Both sides had identified a number of main issues on which "certain decisions" had to be made, he said.
The meeting lasted about six hours in total.
The talks started at noon after a significant delay, with fierce fighting for control of Ukraine's main cities continuing despite the negotiations.