This was announced by the U.S. Department of Defense press secretary Peter Cook at a briefing.
The MOU includes specific safety protocols for aircrews to follow. These protocols include maintaining professional airmanship at all times, the use of specific communication frequencies and the establishment of a communication line on the ground. The U.S and Russia will form a working group to discuss any implementation issues.
The MOU does not establish zones of cooperation, intelligence sharing or any sharing of target information in Syria. The discussions through which this MOU was developed do not constitute U.S. cooperation or support for Russia's policy or actions in Syria.