SOUTH PORTLAND — Defense officials from Maine, the federal government and the Balkan nation of Montenegro are meeting today in South Portland to discuss the two countries’ military relationship.

The Maine Army National Guard has developed a partnership with the Montengerin military to assist the latter in training and officer development. The country, which broke away from Serbia in 2006, is shifting from a conscript military to an all-volunteer force, Maine officials said.

Today’s meeting includes U.S. Deputy Assistant Secretary of Defense Celeste Wallander, Minister of Defense for Montenegro Boro Vucinic and Maj. Gen. John W. Libby, the adjutant general of the Maine National Guard.

The daylong conference, being held at the Mariott Sable Oaks in South Portland, will focus on Montenegro eventually joining the NATO military alliance.