Russia cuts off gas supply to Poland and Bulgaria

Russia's state-owned natural gas company announced it has stopped supplying natural gas to Poland and Bulgaria. 
It will not be supplied until the price is settled in the ruble denominated by Russia. 
While the EU relies on Russian energy, it has argued that it is a "threat" to Europe that has imposed sanctions against Russia, and the conflict is inevitable.

On the other hand, Poland and Bulgaria announced that they had received notifications of supply suspension, but explained that there would be no problem with supply for the time being by securing alternative suppliers.

Russia's next target is Poland or Bulgaria or Japan? Surely, Russia is Injustice and unacceptable.