The US President has seemingly left Iran with no options, referring to the position as a "no-trump" situation - a term derived from card games. The diplomatic maneuver is part of the ongoing diplomatic engagements between the two countries regarding Iran's nuclear program and related sanctions. The exact details of this move and its potential implications to the international balance of power remain to be seen.
The situation between the US and Iran carries significant weight in Japan, a country deeply reliant on the US for its defense and security. The peace and stability of the Middle East, including Iran, influences Japan's energy security, as it imports a large part of its oil from this region. Any conflict escalation can have dire consequences for its economy and national security.
Similar diplomatic maneuvers in the US and the EU often deal with the underlying issues behind the scenes. The public usually doesn't get a deeper understanding until much later, when either agreements are signed and announced, or conflicts escalate. However, public involvement and scrutiny of such maneuvers tend to be higher in Western democracies.