With President Joe Biden warning that war between Russia and Ukraine is potentially “days” away, the situation in Europe appears to be growing only more dangerous. Into that mix the US and other NATO allies are pushing air power to the front lines. In a new op-ed, Aaron Stein of the Foreign Policy Research Institute and Becca Wasser of the Center for a New American Security argue that the US and Russia would both benefit from a deconfliction line based on their communications in Syria. The Russian threat to invade Ukraine is upending the correlation of forces in Europe, with US and...