One is not relevant to the other. The billions that Europe is spending is orders of magnitude less than they did for most of european history.
Do you think that Europe should not fight against ISIS? Are you referring to the Afghanistan and Iraq invasions? French interventions in Africa? Not all wars are the same. Take a stance instead of using vague expressions.
The fact that wars have mostly stopped in Europe is something worth celebrating and maintaining. And Russia is threatening the status quo in the european continent.