Energy ministers in Europe are discussing how to move away from Russian energy sources. Now, they are considering an embargo on Russian oil.

The ministers gathered in Brussels on Monday.

Last week, Russian energy giant Gazprom cut off gas supplies to Bulgaria and Poland after the two countries refused to pay their debts in rubles, as Russia had demanded.

At a news conference after the meeting, European Commissioner for Energy Kadri Simson said Gazprom's decision is "another turning point in the current crisis" and warned "any member state could be next."

She also stressed that any payments in rubles would be unacceptable and a violation of previous EU sanctions.

During the meeting, the ministers confirmed that the bloc will advance efforts, such as stockpiling, to prepare for a situation where gas supply is disrupted in more countries.

They also agreed on possible bilateral agreements to enable member countries to provide gas to each other in an emergency.

Russia provides about 30 percent of the EU's oil and about 40 percent of its gas.

Last month, EU officials adopted a ban on imports of Russian coal, but an embargo on oil would be harder to make up.

Authorities in Germany have been cautious, but they may be prepared to take the step.

EU officials will reportedly discuss the idea as early as Wednesday.