Russia will service its external debt obligations in roubles if the United States blocks other options, Finance Minister Anton Siluanov told a forum on Wednesday.

Siluanov said Russia will not call itself in default as it has money to pay its debts.

Washington is considering blocking Russia's ability to pay its U.S. bondholders by allowing a key waiver to expire next week, a U.S. administration official said on Tuesday, which could put Moscow closer to default.

(Reporting by Reuters; editing by John Stonestreet)