1) why would China get involved. They have no interests in Syria and are no more than a regional power. answer -They are dead against intervention from the US
2) why would Russia show to the world that their military is so defunct and so far behind the west. What's in it for them. - Loaded question, try harder.
3) you have still not stated what their capabilities are / answer - nor have you
4) Britain and Russia have the capabilities to wipe each other out. The US has the capability to wipe Russia out 100 times over / - not sure what we're supposed to say here, but you wouldn't be worried if one country wiped out another ??? ok then.
5) Britain has the capability to wipe out China, China does not have the capability to wipe out Britain. / and that means what ? as UK Government have voted not to intervene.
6) why would they get involved, again. What is in it for them, prestige ( not a lot of good when you are a burning wreck), see answer to question one, they are against US intervention
7) tell us why...../