The Latest on the NATO Summit in Warsaw (all times local):

10:50 a.m.

Over dinner, NATO leaders gave a glum assessment of Russia's geopolitical intentions, a NATO official says, agreeing that Moscow "is likely to exploit any vulnerability" in the Western Balkans, Moldova and Ukraine.

The official, who was not authorized to make public remarks and spoke on condition of anonymity, says President Barack Obama and the other alliance leaders agreed during their Friday evening discussion that they need to maintain "a firm and united stance" on Russia and that Moscow "has to deliver" on its commitments under the Minsk agreements designed to stop the fighting in eastern Ukraine.

One particular focus of the NATO leaders during dinner was the Western Balkans and the independent nations that once were part of Yugoslavia, like Macedonia.

— John-Thor Dahlburg

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9:30 a.m.

U.S. President Barack Obama and other NATO leaders have begun the second day of a summit meeting in Warsaw that's expected to lead to decisions about Afghanistan, the central Mediterranean and Iraq.

On Friday, leaders approved the deployment of four multinational NATO battalions to Poland and the Baltic states to deter Russia, as well as a Romanian-Bulgarian brigade for the Black Sea region.

The Warsaw summit, NATO's first in two years, is considered by many to be the alliance's most important since the Cold War.

NATO Secretary-General Jens Stoltenberg says NATO needs to adapt to confront an array of new threats to its member nations' security, including cyberattacks and violent extremism generated by radical Muslim organizations like the Islamic State group.