Update(9:01ET): Russia on Monday has issued a firm and unyielding response to G-7 ministers who had dismissed as "unacceptable" its plan to only accept ruble payments for Russian gas going to "unfriendly" nations.

Earlier Monday German Economy Minister Robert Habeck said from Berlin that the Kremlin demand for natural gas contracts to be paid in rubles is a "one-sided and clear breach of contracts" - saying the contracts must be honored under prior conditions, according to Bloomberg. "That means that a payment in rubles is not acceptable and we urge the relevant companies not to comply with Putin's demand," Habeck said. "Putin's effort to drive a wedge between us is obvious but you can see that we won't allow ourselves to be divided and the answer from the G-7 is clear: the contracts will be honored."

The Kremlin's quick shooting down of the German economy minister's comments and the G-7's stance on the ruble came Monday via a Russian lawmaker to state-run RIA Novosti: "Russian lawmaker Abramov says G7's refusal to pay in Russian roubles for gas will definitely lead to a halt in supplies."