Europeans NEVER cared about one another. Never. When Czechoslovakia (or Hungary) was attacked by Soviet Union, nobody in Europe rised a single voice of support against injustice. Not single time during cold war. It was only Reagan who dared to push Soviet limits. All Europeans complied and many would like to return into decades when USA paid for the Western defenses, while East was brutally oppressed by colonial power. When I was in Western Europe before 1989 and I had to hear from the westerners how dare these fascist, ungreatfull Czechoslovaks are for opposing glorious empire like Soviet Union that meant so well for peace and stability of Europe. Who cared in Europe when Prague or Budapest was littered with burned bodies and destroyed buildings after 1956 or 1968 invasions? What did Europe do when Serbian sieged Sarajevo for 3 1/2 yearsthat caused deaths of tens of thousands people there in the 1990s? Europe did nothing for stop rise of Hitler or Stalin. Europe would do absolutely nothing for Ukraine. If Russki will bomb Kiev, they will not care a bit. Europeans always kissed Russia; before 1989 it was the extreme bolsheviks; today it is right wing parties that see in Moscow a salvation from decadent West. The biggest supporter today of Russian's takeover of Eastern Europe is Germany. Its policy since 1990 was compliance towad Russia and they were the biggest opponent NATO and EU expansions toward eastern Europe. They opposed moving US bases there as well. The biggest opponent of both Russia and Germany is Poland and they know why due experiences from 1939. American press notices in this article something what is know in Central and Eastern Europe for 25 years:
http://www.nytimes.com/2014/05/06/opinion/why-germans-love-russia.html?_r=0
It is not American problem to solve European mess and I sometimes hope that for once Russia or Arabia will take over entire continent and Americans would not have to lift a finger a bit. They would deserve it.