Speaking ahead of a full session of the summit in Riga on Friday, Merkel also said the summit declaration will express the EU’s firm stance regarding the inviolability of states’ territorial integrity.

"The conversation was very harmonious, and we reached agreement,” Merkel said.

“It will be a joint declaration where all the parties have agreed that the territorial integrity of all countries should be respected, and there will be a clear perspective for visa-free travel by the end of this year if the necessary criteria are met."