The GOP seems to be trending towards what I'd like to refer to as "hawkish isolationism". That is, they are not afraid to intervene or flaunt military options in foreign affairs, but they are also more than willing to do so unilaterally without reaching anything above a minimal consensus among close allies.
This is pretty much where the GOP is at right now. Their neoconservative wing was damaged beyond repair as a result of the Iraq war fallout. Even a lot of the Party's base is skeptical of starting new wars (I'll find the poll for this. EDIT:
Here's one of the base regretting the Afghanistan war) but they also simultaneously have this gut instinct which is a carryover from the nationalism of Reagan-Bush to defeat anybody who tries to mess with the United States. It's not gonna end well for them either way if they continue to alienate our allies in their endeavors.