METALS-Aluminium prices extend gains on Rusal sanctions

(Adds Shanghai closing prices, updates London prices) BEIJING, April 10 (Reuters) - London aluminium prices rose for a fifth straight day on Tuesday, striking a five-week high, as U.S. sanctions on Russian producer United Company Rusal continue to fuel concerns over supply. London aluminium is up 7.1 percent over the past three trading days, whereas aluminium prices in top producer China have risen only 1.9 percent since the Rusal sanctions were announced on Friday. "The (Chinese)