Kim Jong Un’s powerful sister, Kim Yo Jong, warned the Biden administration it “better refrain from causing a stink” if “it wants to sleep in peace for the coming four years.” Kim Yo Jong, vice department director of the Central Committee of the Workers’ Party of Korea (WPK), issued a statement on Monday criticizing the U.S.-South Korea joint military exercises and threatened to retaliate. “We take this opportunity to warn the new U.S. administration trying hard to give off [gun] powder smell in our land,” said the statement. “If it wants to sleep in peace for the coming four years, it had better refrain from causing a stink at its first step.” The South Korean and U.S. militaries began annual military exercises last week that continues through Thursday. The drills are command post exercises and computerized simulation and don’t involve field training due to COVID-19 and diplomatic efforts to resume …