Japan should be on alert for any spillover effects from rising foreign market volatility that could affect liquidity conditions for its financial institutions, the International Monetary Fund said on Friday. The IMF also said the country needed to be vigilant about monitoring any fallout from the Bank of Japan's interest rate rises, such as an increase in the government's debt-servicing costs and a possible jump in corporate bankruptcies. "As interest rates rise, the cost of servicing the large public debt is expected to double by 2030, putting a premium on a robust debt management strategy," the IMF said in a statement released after its consultation with Japanese policymakers.