President Donald Trump said on Monday that he has not discussed specific security guarantees for Ukraine and reaffirmed the U.S. commitment to support the country. The potential security guarantees for Ukraine represent a major obstacle to ending Russia's war in Ukraine.

President Trump has "a lot of cards left to play to apply pressure" to end the Russia-Ukraine war, Vice President JD Vance said in an interview broadcast Sunday. The big picture: Vance said on NBC News' "Meet the Press" that he didn't think Moscow was stringing Trump along after Russia's Foreign Minister Sergei Lavrov said in a separate interview on the same show that no leaders' meeting had been planned between Russia's Vladimir Putin