2) According to constitution, acting president has no access to army command. Turchinov has no right to do anything using armed forces. He can't give any orders to armed forces and he can't sign any law related to them.
Common sense and logic does not apply to NATO and the US. That is why the whole world despises them. What was the need to use force against the protesters at Mariupol. From what I have heard, it was the Right Sector terrorists who shot at the civilians, while the regular soldiers refrained from using force. That is the NATO strategy, to use the terror of Blackwater and Right Sector against the civilians.