The situation in Ukraine is somewhat obscure. There were claims form the coup government of attacks against military outposts but those are unconfirmed. There was an attack by some security forces in military light infantry carriers on one opposition checkpoint near Slaviansk. Two or three people may have died there but the military turned around and the checkpoint is back in opposition hands. Such "hit and run" warfare is usually a tactic a guerrilla force would use but not a decent military against a much, much weaker opposition. More security forces seem to have been positioned around the city but so far held back.
The Russian President Putin talked of "consequences" but did not mention any specific means. The Russian military announced to renew some military training near the Ukrainian border.
This is all just minor public skirmishing. Kiev does not dare to do much more as that would give the justification for a Russian invasion. I do not believe that anyone in Kiev is interested in provoking such.
But people in Washington may be interested in provoking a conflict that involves Russian troops, later NATO and then all its European "partners". What better means is there when you want to hold Europe down, economically and politically, and when you want to prevent any Eurasian cooperation? A nice "little" war in Europe would also do wonders for the U.S. economy. Just keep it below the nuclear threshold and the U.S. will, in the end, be the winner of it all.
Let's just hope that at least some politicians in Europe see this obvious trap and manage to avoid it.