BERLIN (AP) — German energy company RWE says it has completed the 5.1 billion euro ($5.7 billion) sale of its oil and gas exploration and production division to a Russian-linked investment company. RWE AG announced the planned sale of its Dea unit to LetterOne Group, an international investment arm of Russian billionaire Mikhail Fridman's Alfa Group, last March — just as tensions mounted between Russia and the West over Ukraine.