So... Motorola was only fighting this on Google's behalf (prior to the purchase)? They were fighting this because it was in their own best interests. Just because their interests align with Google's doesn't make it a 'proxy war.'
It's usually in the proxies interest to fight the war anyway. Vietnam was a proxy war for the US even though Vietnam was fighting it long before the US got involved.
Google gets to fuck with Apple and if they lose they just roll up the company with out exposing the real profits to judgement. Moto bears the risk, Google reaps the rewards, classic proxy war.
Either way I don't think German politicians are ready to intervene.