Maduro has stated that what occur the other day is NOT going to go unpunished.
Maduro has to be very careful. If he starts committing atrocities, the U.S. will intervene and then that will be the end of his regime. I'm sure he and the Russians are aware of this. Maduro's best chance is to push back against the protesters with non-lethal means, as he has been doing.
I'm curious as to what a coordinate, military response by the U.S., Colombia and Brazil might look like. If the U.S. is obligated to intervene, this American wants the Colombians, Brazilians and possibly others to be there with us.
I can envision a scenario where American units go in and wherein Maduro is basically a hostage in a compound, refusing to surrender. Meanwhile, outside, the Venezuelan military decides they're not going to surrender their lives for a two-bit dictator that is likely to flee to Russia, etc. Meanwhile, and regardless of what Maduro does, Venezuela begins anew with new leadership.
The U.S. is NOT going to tolerate Maduro and his collection of international goons for much longer. He should get while the getting is good. Take some gold and fly to Cuba and retire on the beach. Or, get obliterated by a bunker buster.