Security conference in Germany brings together top officials

Dozens of world leaders, top defense officials and diplomats are gathering in southern Germany for an influential security conference amid growing strains between the U.S. and other NATO nations and Russia over the conflicts in Syria and Ukraine.

U.S. Secretary of Defense James Mattis is heading this year's American delegation to the Munich Security Conference. Other participants include British Prime Minister Theresa May, Israeli Prime Minister Benjamin Netanyahu, Iraqi Prime Minister Haider al-Abadi, Ukrainian President Petro Poroshenko and the foreign ministers of Russia, Iran and Turkey.

The conference, which runs Friday through Sunday, provides an informal setting where diplomacy is often conducted on the sidelines, and already officials from Russia, Ukraine, France and Germany have said they'll meet for talks on the conflict in Ukraine.