U.S. President Donald Trump told President Volodymyr Zelenskiy on Monday that the United States would help guarantee Ukraine's security in any deal to end Russia's war there, though the extent of any assistance was not immediately clear.

A troop of European leaders will support Volodymyr Zelenskyy on Monday as the American president fueled new alarm among Ukraine's allies after his summit with Vladimir Putin.

Donald Trump and Vladimir Putin ended nearly three hours of high-stakes talks in Alaska without any sign of a Ukraine ceasefire deal – raising questions over the trajectory of the war and the fate of European security.

The problem is that they have no strategy of their own for ending the Ukraine war, other than hoping to contain Russia over the longer term.