Japan likely sold US Treasuries to fund record yen intervention

The data points to a concrete funding source for Japan's intervention, moving the discussion from speculation to balance-sheet reality. Selling foreign securities, likely short-term US debt, means the operation's cost is now visible in official holdings, which could constrain the scale of future interventions if reserves are perceived as stretched. The coordination with the US adds a layer of policy signaling, suggesting that the intervention was not unilateral. The open question is whether this pattern of selling Treasuries will continue if yen pressure persists, which would link Japan's currency policy more directly to US debt markets and potentially influence yield dynamics.