For Trump to suggest that Russia should be reinstated is essentially to say that invading and annexing Crimea was OK.
Trump is banking on weapons production and sales as a revenue stream (and a source of manufacturing jobs) for the U.S. Likewise, Russia needs new cash flows to offset low oil prices and the effects of Western sanctions.
The deeper one dives into 21st century advanced, multi-lateral conflict, the more a "chess vs. checkers player" narrative emerges from the optics of the Putin/Trump relationship.
A more “open-ended” narrative that political operatives and the media have a more difficult time managing is that the “Russia, WikiLeaks, and the Election of 2016” story is itself a small part of a larger narrative about America’s particular historical moment.
Here are a few analysis and prediction-heavy notes spinning out of what Democrats may eventually come to see as the most damaging event of this election cycle.