China is allied with Iran and has long term trade relations with the country, importing large amounts of oil from Iran, and supplying Iran with air defense systems and other military and economic support.

China also views the US as a strategic rival and would love the opportunity to take us down a peg.

Don't think that America's strategic opponents -- Russia, North Korea, Iran, China, Algeria do not provide some mutual support, even if for purposes of survival, and view the US as threat. We have already taken out Venezuela, Lybia, Syria and flipped Armenia. Cuba, Iran are next on our radar, but we are active all over the world trying to flip pro-Russian/pro-Chinese governments to pro-US governments.