Trump's ambitious goal of ending the Russia-Ukraine war upon taking office failed to pass, held up by the irreconcilable visions of Kyiv and Moscow.

The warnings over the offensive come as a U.S.-brokered peace process has limped along with inconclusive meetings and little concrete results.

After an unprecedented three-day wave of Russian aerial attacks in Ukraine over the weekend, the world is once again looking to U.S. President Donald Trump to take his first steps toward forcing Moscow to end its violence.