I guess this could be milked for months if not years of intrigue.
But I think the best approach (and maybe even Trump will eventually do something like that) will be just to laugh at them and say yeah, we were talking with Russia, and look at the results... we’re now good friends and Russia is off of its conquest-for-self-esteem kick... now if you Democrats and anti-Trump Republicans want to make a conspiracy theory out of that then go right ahead and knock yourselves out, but I think you’ll just look silly.
Next thing you know, Snowden is shipped home as a ‘gift’