Russia is supplying weapons to everyone who can afford them because they need the money in a bad way.China may become an aggressor in the coming years, but as of now it has a lot to lose. If they attack Taiwan or any other Pacific nation they will lose international finances from western companies.
"Russian politics may have changed, but the lies remain the same." I believe that Russia may have changed its old Soviet doctrine from the cold war, but now they seem to be hell bent on supplying rogue regimes, or questionable governments in an effort to create proxy wars with the west (U.S. in particular). Since they know that a head on conflict with the United States is mutual suicide, they either want to keep our military involved with Arab or middle eastern conflict. Or instill China to cause a proxy conflict with the U.S.
Iran will obviously obtain the bomb since the west will not act now to get rid of the needed facilities to produce a bomb. They want this not to use on the U.S. or west, but obviously Israel and the Arab nations. If it can not obtain that Arab oil then if will destroy the facilities needed to refine and ship or contaminate it.
Russia is actually relieved that these terrorist cells are concentrated against the U.S so that they have time to have their act together when Al Qaeda decides to restart things with them.
Iran will not have the leisure to make a nuke, this issue will be settled before it happens.