LONDON (MarketWatch) -- Russian Prime Minister Vladimir Putin on Wednesday blasted four billionaires for not investing enough in the nation's power sector and said their firms will face sanctions, news reports said. Putin said OGK-3, controlled by Vladimir Potanin, TGK-2, controlled by Leonid Lebedev, TGK-4, controlled by Mikhail Prokhorov, and Complex Energy Systems, controlled by Viktor Vekselberg, had not met their obligations, Reuters reported. The firms face fines and won't be able to sell power at market prices, the report said