By Hyonhee Shin SEOUL (Reuters) – North Korean leader Kim Jong Un pledged to counter U.S. nuclear threats with nuclear weapons as he inspected a test of the country’s new intercontinental ballistic missile, state media KCNA said on Saturday. The isolated country tested an intercontinental ballistic missile (ICBM) on Friday a day after warning of “fiercer military responses” to Washington beefing up its regional security presence including nuclear assets. Attending the site with his daughter for the first time, Kim said threats from the United States and its allies pursing a hostile policy prom…