Ukrainian President Volodymyr Zelenskiy said the territorial dispute was a central issue for the tripartite talks.

Russia attacked Ukraine’s capital Kyiv with ballistic missiles early on Tuesday, local authorities reported, following a week-long pause in strikes on major cities and infrastructure agreed to by Russia and the US as Ukraine grapples with plummeting winter temperatures.

Several more were wounded in the attack on the bus, which was carrying mineworkers in the southeastern city of Dnipro.

A new report warns that the number of soldiers killed, injured or missing in Russia's war in Ukraine could reach 2 million by spring

Russia's defense spending has surged, burdening the economy as sanctions strain resources and borrowing increases to fund military costs.

Zelenskyy said in an evening address it's "still too early to draw conclusions."

Negotiators from Russia, Ukraine and the United States have concluded their two-day meeting in Abu Dhabi on Saturday without announcing any results in their efforts to end the almost-four-year-long war.