ZURICH (Reuters) -UBS expects to complete its takeover of Credit Suisse "as early as June 12", which will create a giant Swiss bank with a balance sheet of $1. The deal was backed by 200 billion francs in liquidity support from the Swiss central bank as well as the government's commitment to swallow up to 9 billion francs in losses on top of those borne by UBS. Ermotti, who was brought back to UBS to steer the takeover, was optimistic about the challenges ahead and rejected concerns the new bank was too big for Switzerland