• The U.S. officially pulled out of a nuclear arms treaty with Russia that dates back to the Reagan Era.

• The signing of the Intermediate-Range Nuclear Forces (INF) Treaty led Russia and the U.S. dialing down their nuclear arsenal in 1987.

• Now, many fear the collapse of the treaty could mean a news arms race.

President Trump says that the USS Boxer “destroyed” an Iranian drone after it flew too close to the U.S. battleship and ignored calls to stand down. The Iranian military releases a video that they argue proves the U.S. did not destroy their drone. The incident, along with British and Iranian militaries recently impounding each others’ vessels, shows just how precarious the Gulf’s maritime security is, according to the Washington Post.

Iran confirms they shot down a U.S. drone, but claims the drone was in their airspace. The U.S. argues the drone was in international waters. Trump approves a retaliatory airstrike against Iran but calls it off at the last minute, citing the potential loss of human life. Trump later institutes new sanctions on Iran

Iran says it will likely break the nuclear pact it agreed to in 2015 that Trump withdrew the U.S. from in 2018. The announcement comes days after U.S. Secretary of State Mike Pompeo claimed the country was responsible for an attack on two U.S. tankers in the Strait of Hormuz. Following Iran’s announcement, Trump orders an additional 1,000 troops to the Middle East

Trump vetoes a resolution that would have ended the U.S. participation in the Yemen War. The second veto of his presidency stops a resolution that passed the House by a vote of 247-to-175 and the Senate by a vote of 54-46, with seven Republican senators joining Democrats in support

Juan Guaidó, leader of the opposition party, declares himself the legitimate president of Venezuela. Nicolás Maduro claimed victory weeks earlier in a presidential election many considered rigged. The Trump administration backs Guaidó as the rightful leader

U.S. troops start transporting military equipment out of Syria in first steps of the Trump-ordered exit from the region