Ukraine may revise its offer to Russia of a ceasefire along the de facto front line if the United Nations Security Council fails to pass a resolution urging a full and unconditional end to the hostilities, a top Ukrainian official said on Monday.

Ukraine's envoy to the ‌U.N., Andriy Melnyk, spoke during a lengthy session of ​the U.N. Security Council, the sixth such meeting called to address the war in recent months.

"Ukraine ⁠stands ready to engage in direct negotiations with Russia to ​secure a just and lasting peace in accordance with the U.N. ⁠Charter, but our patience is not endless," he said, noting Ukraine had repeatedly urged the Security Council to adopt a resolution for a full and ‌unconditional ceasefire.

"If the Security Council would further choose ​a wait-and-see approach, I ‌cannot exclude that Ukraine may recalibrate and modify its offer. Ceasefire along the de ‌facto front line is already a great compromise," he said. He gave no further details.

Melnyk insisted that Ukraine had changed ⁠the dynamic in the war, now ‌in its fifth ⁠year, with recent strikes, adding that some 40% of Russia's oil refineries had ⁠been ⁠damaged.

Joined by other Security Council members, Melnyk strongly condemned a Russian strike on the ‌historic Pechersk Lavra monastery in Kyiv last week.

Russia has denied that it attacked the UNESCO World Heritage site, blaming the strike on a ‌U.S.-made ​Patriot air defense missile, a ‌claim repeated by a top Russian official during the U.N. session.

Moscow has said its attack targeted and struck ​drone manufacturing facilities, while Ukraine and many Western countries accused Russia of striking the monastery.