"do tell us, what communist country was successfully invaded by the West?"

  LOL.
  That's been a major part of the problem: Capitalists have been waging wars for at least 500 years. And botching almost every one of them. In the genocidal process of invading every part of the world, capitalists have slaughtered more people than communism has, and capitalists have destroyed every attempt to make communism decent.
  You might have noticed - communism has been defeated, but the world is still at war almost everywhere, poverty prevails,  economic suffering is ubiquitous, and man's inhumanity to man is omnipresent.