By Zandi Shabalala and Eric Onstad LONDON (Reuters) – The London Metal Exchange suspended deliveries of some Russian produced metals into its approved warehouses in Britain on Friday, although there is none stored in them at present. The exchange, which is owned by Hong Kong Exchanges and Clearing Ltd, said in a statement that there was significant risk that someone receiving such metal from British warehouses would be hit with very high additional costs. The British government placed 35% additional duties on imports of Russian copper, lead, primary aluminium and aluminium alloy on March 15. h…