It says it is a supplement to the previous decree where debts in foreign currency have to be paid to a Russian bank account and only after the money is received is the debt cleared. It also states debt repayment does not entitle that client to resumption of gas supplies. In other words, if you are an unfriendly country and you owe money, you can pay in foreign currency, but not to a European bank where it can be confiscated as it used to be the case, it has to be received in a Russian bank, and don't expect to get more gas in the future. Seems pretty clear to me this is to settle outstanding debts from sore dine and dashers like Poland and Finland.