Before Biden, various US presidents had respected an unwritten understanding between Russia and the West that Ukraine would not be invited to join NATO.
Zelenskiy reiterated that Ukraine would not concede any territory to Russia as part of a peace deal.
In an extraordinary Oval Office meeting on Friday, Trump threatened to withdraw support for Ukraine, three years after Russia invaded its smaller neighbour.
Before Biden, various US presidents had respected an unwritten understanding between Russia and the West that Ukraine would not be invited to join NATO.
Zelenskiy reiterated that Ukraine would not concede any territory to Russia as part of a peace deal.
In an extraordinary Oval Office meeting on Friday, Trump threatened to withdraw support for Ukraine, three years after Russia invaded its smaller neighbour.
