PARIS, Feb. 14 (Xinhua) -- The North Atlantic Treaty Organization (NATO) should improve its defense policy and boost action to better ensure security in a context of growing threats, French President Francois Hollande said on Monday.

At a telephone talks with NATO's Secretary General Jens Stoltenberg, Hollande stressed France's "commitment to the development of a more ambitious European defense policy."

"NATO must continue to show its ability to adapt its missions to a context of growing menaces," the French leader said in a statement released by his office.

"The coherence of the alliance's action is the best guarantee of its effectiveness," he added.