June 22 (Reuters) – Ukraine may revise its offer to Russia of a ceasefire along the de facto frontline 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 UN, Andrii Melnyk, spoke during a lengthy session of the UN 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 UN 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. Melynk insisted that Ukraine had changed the dynamic in the war, …