CHICAGO (Reuters) – Wal-Mart Stores Inc (WMT.N) has appointed Lev Khasis, the former head of Russia's biggest food retailer X5 (PJPq.L), as a senior vice-president, a company spokeswoman said on Thursday. Khasis confirmed his appointment but declined to give any details about his intended role at the world's biggest retailer. Wal-Mart has been talking about entering the Russian market for years but appeared to have given up in December when it closed its Moscow office due to a lack of acquisition opportunities. "We still believe the Russia market has promise and we'll continue, as we do in markets all over the world, to watch for the right market-entry opportunity," the spokeswoman said. Khasis, 45, built up X5 through acquisitions into a Russian market leader with $11 billion in annual...