Yes a world leader previously said:
My own preference is a proposition of an armistice for six months, with the Black Sea ports open to the commerce of the world. This would put a stop to the effusion of blood, and hostilities would probably never be resumed. We can urge it on the high grounds of humanity and the interest of the whole civilised world. If it be refused by the Ukraine, it will afford good reason for recognition, and perhaps for more active intervention.
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Oops. The above was said by the Emperor of France, in 1862, about Southern ports and potential Union refusal to reject a European demand for a ceasefire.
Not America’s business to tell Ukraine to concede territory.
By all means, tell Europe the money supply to Ukraine is ending (especially when these hypocrites continue to import Russian LNG). But Americans didn’t cotton to European interference into its affairs in the 18th, 19th, 20th, or 21st centuries, and we should not be interfering in Ukraine’s affairs. Let their men fight for their country, as American men fought for theirs in 1776, 1812, and 1862.