Negotiations aimed at ending Russia’s invasion of Ukraine are yielding apparent signs of progress, but major challenges remain on the path to a final settlement, a senior Kremlin official said Monday.

While some Europeans still object to the American insistence that Washington should be an even-handed mediator, rather than an ally of Ukraine, there is also a sense that Europe and the Trump administration can play complementary roles in attempting to end the war.

Talks to end the war in Ukraine continue as the fourth anniversary of Russia's full-scale invasion approaches.

President Volodymyr Zelenskyy said Sunday that a U.S. security guarantees document for Ukraine is “100% ready” after two days of talks involving representatives from Ukraine, the U.S. and Russia.

Abu Dhabi hosts trilateral meeting with the U.S., Ukraine and Russia in a possible sign that the nearly four-year war could be coming to an end.

ArcelorMittal Kryvyi Rih, Ukraine's largest steelmaker, will close one of its production units in the second quarter, it said on Monday, citing EU environmental policy and high local power prices caused by Russian attacks on energy infrastructure.