The latest American strikes against Houthi positions may be the last message from the Trump administration to Iran before the decisive moment arrives for its nuclear program. Iran is facing its most difficult challenge since the victory of Ayatollah Khomeini's revolution, and it must choose between the safety of its regime or a confrontation with a foregone conclusion. The region is experiencing new balances of power and roles, with Trump playing a decisive role and Russia focused on Ukraine. The decisive moment for Iran is approaching.