The powerful sister of North Korean leader Kim Jong Un has warned the U.S. military that it will face a "very critical flight" if it repeats what she called acts of "illegal intrusion," state-run media reported Tuesday.The statement by Kim Yo Jong, a senior official of the ruling Workers' Party, was released by the official Korean Central News Agency, which reported Monday that a strategic reconnaissance plane of the U.S. Air Force had violated the country's airspace off its coast.Kim criticized South Korea for denying that the U.S. military has been violating North Korea's sovereignty by m…READ FULL ARTICLE