Send China the bill to keep ROK in check. If China does not pay, then debt collection against US treasuries. We need to monetize our international support to lower our debt. ROK can only do this with China's monetary support.
China is winning a cold war but our military leaders and politicians cannot see it. They sponsor global conflict with low tech, forcing us to responds with far more expensive high-tech. Thus, we get more credit from China. The cycle continues, but we are now the Russians and losing.