Negotiators for the warring sides in Istanbul appeared to make little progress on ceasefire terms or a possible summit between their presidents – with their meeting ending after less than an hour.

The warring sides remain far apart after the third round of U.S.-brokered peace negotiations on Wednesday. But there was progress on humanitarian issues.

Under the deal, Russia and Ukraine would swap 250 prisoners of war each. Ukraine’s former defence minister Rustem Umerov, who led the talks in Istanbul, said that the two sides have also agreed to “exchange of at least 1,