The Trump administration made clear it will abandon peace attempts for Ukraine if Russia fails to adhere to any terms, but the president did not say whether there would be consequences.

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A full ceasefire in Ukraine is "unrealistic," Russia's U.N. Ambassador Vasily Nebenzya said during an April 17 briefing, challenging diplomatic efforts to halt the fighting. The statement came more than a month after Ukraine agreed to a full 30-day ceasefire proposal,