NATO foreign ministers hold a second day of talks on April 2 in Brussels.
According to reports, discussions are expected to focus on Afghanistan where security is now mainly in the hands of the Afghan National Security Forces ahead of the withdrawal of international combat troops at the end of December.
Meanwhile, the Pentagon says there were no U.S. military deaths in Afghanistan in March -- the first zero-fatality month there since January 2007.
U.S. casualties in Afghanistan have declined as the number of U.S. forces has grown smaller and their role has shifted away from combat.
U.S. troops are focused on training and advising Afghan forces.
The Pentagon says there are about 33,000 U.S. troops in Afghanistan, down from a 2011 peak of about 100,000.
Based on reporting by AP