1) This debt is not a problem as long as it is cheap to service. China also has a huge debt. Any country that claims to rule the world has a huge debt. The UK's debt was 180% of its GDP in the late 18th century. This did not prevent it from ruling the world for over 100 years. 2) Russia is a paper tiger, and China could easily collapse if it does not gain access to the largest and most solvent market, which is the United States. The United States could easily destroy China's economy through sanctions. Neither China nor Russia can physically reach the United States. Nuclear war is excluded by the theory of guaranteed mutual destruction. 3) Society in all countries is degrading, as are moral values. Rich Arab sheikhs can do whatever they want, but behind closed doors. In all countries, the birth rate is falling and degeneration is increasing. 4) The United States has the most powerful navy and air force. The United States can kill the entire ruling elite or capture them.
The United States could simply destroy the enemy's air defense system and eliminate the entire ruling class, from generals to ministers, creating chaos.