I think its foolish to think you can stop foreign meddling, its something that has been happening for a VERY long time.
So the answer is to...ignore it and let it go unpunished or responded to in any way?
It's never happened at this scale before.
Also not much solid evidence of it.
Not sure how you can say that with a straight face at this point.
We have evidence Russia was behind the DNC, RNC and Podesta hacks and email releases.
We have evidence of the money spent, ads purchased, and bot farms used on Twitter, Facebook, and other social networks.
We have evidence that Russia compromised state election networks and systems, and in the case of several states were able to access copies of voter registration data.
Mueller just indicted 13 Russians involved in the effort.
And that's just what the public knows. Congress and our intelligence agencies have access to classified information that we don't, and Mueller hasn't finished his investigation.
What more could you possibly be looking for?