By Christine Kim and Yeganeh TorbatiSEOUL/WASHINGTON (Reuters) - North Korean leader Kim Jong Un has delayed a decision on firing missiles toward Guam while he waits to see what the United States does, the North's state media reported on Tuesday as the United States said any dialogue was up to Kim.The United States and South Korea have prepared for more joint military drills, which has infuriated the North, and experts warned Pyongyang could still go ahead with a provocative plan.In his first public appearance in about two weeks, Kim inspected the command of the North's army on Monday, examining a plan to fire four missiles aimed at landing near the U.S.