TOKYO (Dispatches) -- Japanese jets conducted air maneuvers with U.S. bombers southwest of the Korean peninsula on Wednesday as North Korea considered whether to fire missiles towards the U.S.-administered territory of Guam.
North Korea has made no secret of its plans to develop a missile capable of carrying a nuclear warhead and of reaching the United States to counter constant U.S. threats of invasion - such as U.S. war drills with neighboring South Korea and Japan.
The exercise in the East China Sea involved two U.S. Air Force B-1B Lancer bombers flying from Andersen Air Force Base on the Pacific island of Guam and two Japanese F-15 jet fighters, Japan's Air Self Defense Force said in a news release.
"The exercise is meant to improve interoperability and bolster combat skills," it said.
The U.S. planes, which were designed to carry nuclear bombs and later switched to conventional payloads, have flown several sorties in East Asia over the past several weeks. In addition to air drills with Japanese fighters, the bombers have also exercised with South Korean aircraft.
North Korean leader Kim Jong Un delayed a decision on firing missiles towards Guam and U.S. officials have since taken a gentler tone, but tension in the region nonetheless remains high.
The situation is tense since President Donald Trump said the U.S. military was "locked and loaded" for an action against North Korea. Those words in turn prompted a warning from China for both sides to tone down the rhetoric.
North Korea is likely to be infuriated by the current maneuvers and U.S.-Japanese annual joint military drills next week.
In his first public appearance in about two weeks, Kim on Monday inspected the command of the North's army, examining the plan to fire four missiles aimed at landing near Guam, the official KCNA news agency reported.
"He said that if the Yankees persist in their extremely dangerous reckless actions on the Korean peninsula and in its vicinity, testing the self-restraint of the DPRK, the latter will make an important decision as it already declared," KCNA said.
The DPRK stands for North Korea's official name, the Democratic People's Republic of Korea.
Chinese Foreign Minister Wang Yi, in a telephone conversation with Sigmar Gabriel, Germany's minister for foreign affairs, said tensions on the Korean peninsula were showing some signs of easing but had not passed.
The parties involved should "make a correct judgment and wise choice by taking a responsible attitude toward history and people," Wang said, according to a statement on the Chinese foreign ministry's website.