Proponents of improved U.S.-Russian relations might take heart in Donald Trump’s surprise victory in the U.S. presidential election. Tangible positive changes are certainly possible, but fundamental differences over issues such as U.S. missile defense, NATO expansion and Russia’s willingness to use force against its neighbors, as well as the absence of robust economic ties, make a qualitative breakthrough in the bilateral relationship unlikely.

In the Ukraine crisis, President Obama faces the most severe national security test of his administration, writes Will Tobey. The results of his examination will be graded not only in Moscow, but also in Tehran, Damascus, and Pyongyang, and by US allies around the world.