Europe has been increasing defense spending because of the threat of Russia these last couple years
Worrying about the Russians is fine, but the Russians are experts at the Proxy war game. I'm sure they would like nothing better than the armies of Europe squandering themselves against the Muslim horde (a win-win for the Russians), and Russia would doubtless be happy to step in to clean up the mess and 'help' impose order. This is why Brexit and the current French election are so important to the future of Europe. Merkel is a quisling for the Islamists, whether she knows it or not.