The national debt in Japan is around $9 trillion. That is well over 200% of the country’s GDP. Interest payments on the debt make up about a quarter of the country’s government expenditures. But that’s with extremely low bond yields. If yields were to increase to 4%, the debt payment would grow larger than the current expenditures for the entire government. Peter called it a “slow-motion train wreck.”
https://www.zerohedge.com/markets/disaster-guaranteed-happen-japans-slow-motion-train-wreck