Special U.S. envoy Steve Witkoff says Russian leader Vladimir Putin agreed at his summit with President Donald Trump to allow the U.S. and European allies to offer Ukraine a security guarantee resembling NATO’s collective defense mandate as part of an eventual deal to end the 3 1/2-year war.

President Volodymyr Zelenskyy has said that he does not have detailed information about what kind of security guarantees for Ukraine were discussed by US President Donald Trump and Russian leader Vladimir Putin at the talks in Alaska.

The traditionally Russian-speaking area is at the heart of what the Russian president calls the “root causes” of the war, and taking it over is near the top of his list of territorial and political demands.