The mood in Ukraine is one of uncertainty as many wonder if the country can continue to hold out against the Russians without vital U.S. support.

The exchange between Ukrainian President Volodymyr Zelensky and President Trump not only shocked the world, but also there's a good chance the botched visit changed it.

A remarkable shouting match broke out in the Oval Office on Friday between President Donald Trump and his Ukrainian counterpart Volodymyr Zelensky, an extraordinarily fractious display that only underscored the deeply uncertain future of American assistance to Kyiv.