Japan is the perfect example that a country with a sovereign currency doesn't need that nobody buy their bonds. They have been doing this for years and they don

Japan is the perfect example that a country with a sovereign currency doesn't need that nobody buy their bonds. They have been doing this for years and they don't have hyperinflation but the opposite. But logic alone should tell us that already. When foreign countries buy US bonds can only buy them with dollars. You can't buy US bonds with another currency. Where are those dollars coming from?