Biden discussed Sweden's NATO bid with Turkish President Tayyip Erdogan, who wants Sweden to do more to contain PKK supporters.

Biden will hold talks with NATO leaders in Vilnius and deliver a speech at Vilnius University.

He aims to demonstrate a strong, confident America and its allies addressing challenges such as Russia's aggression in Ukraine and the climate crisis.

Biden's visit is part of his re-election campaign and some Republican rivals question his strategy.

Some Democratic lawmakers have raised concerns about President Biden's decision to send cluster munitions to Ukraine, which are artillery shells that release dozens of bomblets and can cause destruction over wide areas.

The White House national security adviser, Jake Sullivan, stated that Ukraine has given written assurances that it will not use cluster bombs in Russia or populated areas.

Biden is scheduled to meet with the leaders of Finland and attend a summit of U.S. and Nordic leaders in Helsinki.