Washington’s Blog 
January 15, 2012
Russia and China Would Consider An Attack On Iran – Or Syria – As An Attack On Their National Security
RT notes :
The escalating conflict around Iran should be contained by common effort, otherwise the promising Arab Spring will grow into a “scorching Arab Summer,” says Dmitry Rogozin, Russia’s deputy prime minister and former envoy to NATO.
“Iran is our close neighbor, just south of the Caucasus. Should anything happen to Iran, should Iran get drawn into any political or military hardships, this will be a direct threat to our national security,” stressed Rogozin.
Here’s what Rogozin is talking about (notice how close the Southern tip of Russia is to Northern Iran):
A Chinese general has also allegedly said that China would launch World War III if Iran is attacked . Andsee this .
In addition, Iran and Syria have had a mutual defense pact  for years. And China and Russia  might also defend Syria if it is attacked. So an attack on Syria could draw Iran into the war … followed by China and Russia.