Iran has announced a significant expansion of its definition of the Strait of Hormuz, a critical chokepoint for global oil trade, now claiming it stretches from Jask in southeastern Iran to Greater Tunb island. This declaration, made by Mohammad Akbarzadeh of the Islamic Revolutionary Guard Corps naval forces, comes just hours before US President Donald Trump is set to meet Chinese President Xi Jinping in Beijing. The strait, historically recognized as a narrow corridor, is now described by Iran as a vast operational area, potentially complicating international shipping routes. The redefinition poses challenges for China, which imports a significant portion of its crude oil from Iran and relies on Persian Gulf suppliers. This development may force Beijing to take a more active diplomatic role in the ongoing tensions, as Iranian crude disruptions have already created economic pressures domestically. The timing of Iran's announcement underscores its intent to assert control over the region and signals to both Washington and Beijing that it is prepared to take action regardless of the summit's outcome.