"Participation of all countries is voluntary. There is no responsibility for violation of the agreement. So, the nuance of the agreement is that countries, which agreed to implement the provisions of the document, should do it voluntary," Novak said in an interview with NTV broadcaster.
On Saturday, OPEC finished a 2-day meeting with non-OPEC countries in Vienna, where non-OPEC countries decided to cut oil output by 612,000 barrels per day, with Russia cutting the output by 300,000 barrels per day. In November, OPEC agreed to cut oil production by 1.2 million barrels per day for the whole cartel.