Russian President Vladimir Putin says that in his view the whole of Ukraine is "ours" and cautions that advancing Russian forces could take the Ukrainian city of Sumy as part of a bid to carve out a buffer zone.

Ukraine's Foreign Minister Andriy Sybiga on Friday said that Vladimir Putin had shown "disdain" for the peace process between the two countries after the Russian president earlier said that the "whole of Ukraine" belonged to Russia.

Ukraine’s foreign minister denounced the statements on social media, stating they show ‘complete disdain’ for U.S. peace efforts