Chinese has the biggest army.
They are #1 trade partner for USA
Russia is the 2nd largest oil exporter in the world
Russian weapons (like tanks, aircrafts, anti-aircraft defence systems, even assault rifles) are the best in the world, and it's being exported to Iran too.
Both has nukes.
I bet the joint action of these 2 countries can ruin States in 2 weeks w/o a single shot
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