Indeed, because the United States used three aircraft carriers in the war in Afghanistan and five aircraft carriers in the war in Iraq. For the United States, it is equivalent to a warning to send an aircraft carrier formation to conduct an exercise after a crisis in a region. Two aircraft carrier formations mean a serious warning. The appearance of three aircraft carrier formations at the same time at least shows that the US military is preparing for war. This time, if three US aircraft carrier formations arrive with US troops stationed in Japan and South Korea, the number of US fighters in East Asia will reach about 400, which is basically enough to carry out large-scale air strikes on North Korea's nuclear facilities.
In fact, the Korean Peninsula issue involves the interests of the six parties and is very complicated. The United States is afraid of the reaction of other countries, but it must put on a real fighting posture to promote talks and force North Korea to stop on the road of developing nuclear weapons. If military deterrence doesn't work, military solution should be the last choice for the United States, because it is unacceptable for North Korea to successfully master the original submunitions.