Not long ago, the United States found itself in the middle of what was increasingly looking like a nuclear standoff with North Korea. President Trump and Kim Jong Un exchanged charged statements in the press, military units from a half dozen countries postured throughout the Pacific, and Pacific powers like Russia and China chimed in on a daily basis — often looking to both encourage peace and discredit America’s diplomatic efforts at the same time. Kim Jong Un’s apparently successful endeavor to develop and test nuclear weapons with nearly global reach was not only significant for the tiny, isolated nation — it had the potential to destabilize an international order that had survived for over 70 years.

Then, seemingly as quickly as it escalated, tensions began to ease. North and South Korea engaged in diplomatic talks that led to the North’s involvement in the Olympics being held in South Korea, and soon after that, talks between the United States and North Korea commenced. Since then, the success of these talks have been questionable, but there’s no denying that, tense as relations may be, they’re better than they were just months ago. The question that remains in the minds of analysts, however, is why?

Some are keen to credit President Trump’s aggressive tone and rhetoric toward Kim’s North Korean regime. The American president took a significant departure from the measured and stately deliveries of past administrations, taking instead to calling the North Korean leader names and threatening him with the might of the U.S. military. At the time, the effort was condemned as needlessly aggressive, but as things began to change on the Korean peninsula, some saw it as a clear sign that Trump’s professional wrestling approach to international diplomacy had worked. However, the behavior of Kim Jong Un in the intervening months seems to indicate that it may have been a different Trump-led initiative that actually changed things, it just wasn’t one that makes for sexy headlines: the implementation of stricter sanctions.

While Kim’s public appearances last year were primarily military in nature, visiting weapons platforms like new ballistic missiles and offering pre-packaged lines about the dominance his military was putting on display, the past few months have been quite different in both delivery and approach. Instead, Kim has been visiting factories, farms, and new construction projects intended to improve the lives of the Korean people. His dialogue, while still often vilifying the United States, has turned toward an effort for economic prosperity rather than empty threats of pre-emptive nuclear strikes. Even more tellingly, Kim has begun publicly admonishing officials that fail to deliver on projects he sees as necessary for the well being of the North Korean people.