METALS-Shanghai aluminium hits 2-mth high after Rio force majeure

(Adds China data preview, updates prices) BEIJING, April 16 (Reuters) - Shanghai aluminium prices hit a two-month high on Monday after Rio Tinto said it would declare force majeure on certain customer contracts in light of U.S. sanctions on its partner, Russian aluminium giant Rusal. Rusal holds a 20 percent stake in Rio's Queensland Alumina refinery in Australia. Concerns over supply shortages focus not only on aluminium but also on the substance used to make the metal. "China and