MOSCOW, Dec. 15 - Gazprombank has demanded early repayment of a loan of $842.5 million to Dmytro Firtash's Ostchem, the bank said in a statement.

"In connection with the inability of Ostchem Holding Ltd to uphold its commitments to Gazprombank under their agreement on a loan of $842.5 million, the bank is compelled to declare the loan and accumulated interest subject to immediate repayment," the statement says.