...Putin has four things on his side, at least in the short-term. The first, of course, is military power. The second is his increasing control of the media and over public opinion in Russia. The third is that his policy appeals to nationalist passion which, apart from ethnic hatred, is probably the strongest political passion of all. The fourth is the weakness of his European opponents.
Europe has no military power and would not use it if it did. No one wants to let the genie of war out of the European bottle yet again. Just as important, the European population doesn’t give fig what happens in or to Ukraine, so long as whatever happens doesn’t drive tens of millions of Ukrainians westward…
[Europeans] are prepared to make no sacrifices to meet such threats, least of all in economic circumstances that are already precarious. For most electorates in Europe, Ukraine is, like Czechoslovakia in 1938, a faraway country of which they know nothing; what they want, and will judge their governments by, is prosperity at home. And only more immediate threats will arouse their national passions sufficiently to resign them to the slightest economic hardship.
Hubris brings nemesis, but hubris takes many forms. One is the belief that the need for vigilance has been abolished because everyone now has the same worldview as ourselves, that the end of history has come, and we are it.
(Theodore Dalrymple, “Why Europe Sleeps,” City Journal)
And, by the way, Ukraine better not depend on the United States either.