The issue for us in Europe won't be Trump winning the US election, it could even be a good opportunity to strengthen EU and build a better EU defence and a real defence Industry (Look at how the debate on which country should have the leadership on the new Franco-German fighter-jet/Tank or whatever).
The issue is that we do have a lot of politicians who are more or less pro-Russia. If Trump can win, so can Le-Pen, if Schröder was corrupted by Russia, how can we be sure that the next german Chancellor won't be ? If Orbàn applies the same policies as Putin why wouldn't him build a strong military alliance with Russia ?
Let's not blame the US for our lack of unity and defence policy