I ask you simply, would Ronald Reagan be making excuses for Vladimir Putin?
Reagan wouldn’t have had to make excuses for V. Putin because Reagan wouldn’t have let the relationship with Russia deteriorate to the point where the United States was backing the violent overthrow of a democratically elected European leader.
When Gorbachev sent troops to crush a pro-independence uprising in Lithuania in early 1991, I don't remember George Bush (who inherited much of Reagan's foreign policy team) threaten an embargo, demand that we arm the uprising, or agitate for war. I doubt that Reagan would have either.
You seem to insist that John McCain and his girlfriend Lindsey Graham have inherited Reagan's foreign policy mantle. Reagan (along with Eagleburger, Weinberger, Baker) was much more of a realist than that. From the hysterics of McCain and the neoconservatives, you'd think that the eastern Ukraine is America's 51st state. It isn't. If the US had a territorial dispute/border skirmish with Mexico, somehow I doubt most people in Russia or China would care very much.