Again, apples vs oranges. The Soviet communists were soviet first and communist second. They would have gladly gone to war against the chinese communists and destroyed them if they could. When the chinese won the soviets took it as a loss and vice versa.
That's not how islam works. an advance for any part of islam is an advance for all islam. Islam is far more evil than communism could ever aspire to.
This is not a war against a state. It is a war against a ideology that forms the bedrock (and most of the structure) of it's adherents lives.
Islam is the enemy
LOL! Tell that to the surviving relatives of a Shiite killed by a Sunni (or vice versa) in the Iraqi civil war whatever they're calling it this week.