Europe is not disintegrating. Europe is just geography.
The European Union might be disintegrating. Why it might be disintegrating is then a more complex thing.
But mostly it's not because of Trump or because of populists or because of Russian influence. It's because those who are building a federal state, United States of Europe, are far too impatient and try to rush it. We are witnessing a backlash. I am myself contributing to a backlash, because EU is doing things it shouldn't.
Yes, I definitely don't want to be in a Russian sphere of influence, but EU isn't acting credibly here. And the White House has little to contribute to current development. It's done by the EU itself by trying to legislate member countries over things I and many others don't want to be legislated at.
Starting from things like whether we are allowed to control who comes to our country and lives here. Or to prepare for and resist to Russian attempts to take over.
EU leaders (Juncker, Schulz and many others) act as if they had an empire, before they actually built it.