By Lisa Twaronite   TOKYO Sun Apr 13, 2014 8:00pm EDT (Reuters) – The safe-haven yen started the week on a firm footing and Asian shares braced for more losses on Monday after a dismal week on Wall Street. Ongoing tensions in Ukraine also sapped investors’ appetite for risk. Ukraine gave pro-Russian separatists a Monday morning deadline to disarm or face a “full-scale anti-terrorist operation” by its armed forces, raising the risk of a military […]