“That probably wasn’t Reagan’s own thinking”
No, it wasn’t.
It was the American Left’s idea, though. Remember how happy they were to spend the “Peace dividend!” once Clinton took office?
I'm not saying Reagan would approve of Pat's isolationism and pro-Putinism, but I wouldn't assume that Reagan would have made some of the decisions subsequent presidents did.
A lot of good Republicans and good Americans have been skeptical about some of our involvements abroad over the years, and I wouldn't throw them over just to oblige Washington elites who made some really bad decisions in foreign policy.