"The EU’s role in the world is gradually growing, but it is not nearly as strong as its population and economic power would suggest,” the Czech minister said.
“I know that it is not at all popular. I think that a European Federation or a United States of Europe would only put Europe in a position where we would be a truly equal partner in the game between China, America, or Russia and India,” he added.
I don’t know why you mention USA, and also the NATO for that matter, when the issue is about the federation of EU? It has nothing to do with USA relations.
Also, FYI, the USA wants and urge EU to be stronger.
And, I don’t see the EU leaving NATO in the foreseeable future. There has only been an increase in NATO membership, so no worries mate.