A new, detailed report on the war underscores that Mr. Putin isn’t winning, and Mr. Trump can still apply military and economic pressure to produce a peace that is honorable.

Russian President Vladimir Putin's envoy, Kirill Dmitriev, said on Thursday that there was progress and a positive movement forward in talks on a Ukraine peace deal.

"These are two countries who have been engaged in a very brutal war for several years, a war that have would have never started if the president were still in office," she added.

Russia launched its biggest aerial assault of the year on Ukraine, ending a pause on strikes on Ukraine’s energy systems and dealing another blow to the country during some of the winter’s coldest day...

Ukraine's military said on Thursday it had carried out a series of "successful" strikes in January on a launch site for Russian intermediate-range ballistic missiles.