This is all unprecedented, but if Trump's collaboration with Putin is deemed treasonous, the Hamilton Electors and/orThe Supreme Court might just hand the election to Clinton, with the Trump ticket having been disqualified. Bizarre and unlikely that we get to that point, but the whole election has been totally surreal, so we'll see...
As for open conflict with Russia, Putin doesn't want that, nobody but people like John Bolton would want open conflict with Russia.