The agreement calls for pilots to be "professional," to communicate over a designated frequency if necessary, and to maintain a "safe distance" at all times.
President Obama has said the U.S. would not "make Syria into a proxy war between the United States and Russia." Given reports that Russia has bombed U.S.-backed rebels, we wondered, is it already?
The Turkish military said it sent the drone three warnings before shooting it down. Turkey did not identify the nationality of the drone. Russia said all its drones in Syria were accounted for.
Russia says its commitment there is limited, but some analysts are skeptical and warn Russia may find it increasingly difficult and expensive to maintain its Syrian operation.
Singer Iris Dement's new album is based on the work of the late Anna Akhmatova, whose spare, insightful lines addressed the ambiguities of love and the tumult of Soviet times.
The Russian missile manufacturer also released its own report, disputing the Dutch findings and instead pointing the blame for last year's crash of the Boeing 777 at Ukrainian forces.
Led by Kurds, the coalition could receive U.S. air support in the fight against both President Bashar al-Assad and ISIS. Its members also include Arabs and Assyrian Christians.
One U.S. official said the cruise missiles were launched from warships in the Caspian Sea. It was unclear where the missiles landed in Iran or if they caused any damage.