The U.S. and Russia put into practice on Tuesday new rules designed to minimize the risk of air collisions between Russian and U.S.-led coalition aircraft over Syria.
With Russia, the U.S., France, England, Saudi Arabia, Jordan, United Arab Emirates, Bahrain and Qatar all fighting in Syria, the danger of a more wide-spread conflict grows.
http://news.yahoo.com/pentagon-russia-us-agree-minimize-risks-syrian-skies-175557742–politics.html
http://www.cnn.com/2014/09/23/world/meast/syria-airstrikes-countries-involved/