Europeans are debating additional funding and contemplating troops in Ukraine as American support appears ever more at risk.

NBC News’ Richard Engel, Former Deputy Assistant Secretary of Defense Evelyn Farkas, and Former U.S. Ambassador to Russia Michael McFaul join Katy Tur to express concerns about Trump’s deference towards Russia.

Whether they do so will likely determine the extent of Europe’s role in shaping a peaceful Ukraine. European diplomats privately say Trump’s broadside against Ukrainian President Volodymyr Zelenskiy last week—when he falsely said Ukraine started the war with Russia and labeled its leader a dictator—was disgraceful and reflected Russian disinformation.

A dozen leaders from Europe and Canada visited Ukraine's capital to mark the date in a show of continued support from some of Kyiv's most important backers.

Ukraine enters the fourth year of all-out war with Russia on Monday, unsure it can rely any longer on its staunchest ally the United States as its exhausted troops fight to hold their ground against unrelenting enemy advances.

The U.S. is lobbying countries around the world to oppose a resolution brought forward at the UN General Assembly by Ukraine and European countries.