LONDON — President Obama spent Wednesday in Brussels talking up the importance of the security relationship between Europe and the United States, but it is considered unlikely that Russia’s seizure of Crimea will prompt increased European military spending at a time of economic anemia and budget cuts. NATO and the European Union regard the Russian move in Ukraine as a wake-up call, a reminder that hard power can easily trump 21st-century assumptions about Europe as a sphere of trade, international law and cooperation. Despite the newly militant tone, NATO members will continue to spend paltry amounts on defense, experts say....