"We also know that it is impossible to replace 100% of Russian gas with alternative suppliers. That means that we also need other alternative, parallel actions," Simson said during an interview with the Atlantic Council.
The statement comes as a coalition of countries led by the United States and Europe seek to diminish Russia’s revenue from energy exports, including by imposing a $60, adjustable price cap on Russian oil.
Europe began moving away from Russia as a supplier of energy following the beginning of its special military operation in Ukraine on February 24.
Projects to connect the continent to new sources of energy include a turn to the United States as a supplier of fuel and plans by Slovenia to build a pipeline to Hungary for Algerian gas. However, Hungary still receives some 85% of its gas from Russia.
Earlier this month, Hungarian Prime Minister Viktor Orban said he would seek an exemption from EU sanctions on Russian gas and atomic energy.