The opposition, which is taking orders from abroad, as the russian foriegn minister has said, can be told to stop shooting at the government, and it will stop in 1 second. I and the whole world can see the opposition armed to the teeth with machine guns. In the UK/isreal/usa, if there was any armed opposition, they would be shot 10 times in the head.
We want Iran cooperation, not meddling, Gulf Arabs tell Kerry (Reuters)
from the article: Report: Assad's army kills 60 in intense shelling of Syria's Homs