US intelligence assesses that Iran's new supreme leader Mojtaba Khamenei is actively shaping Tehran's war strategy alongside senior regime officials, though the exact scope of his authority within the fractured Iranian government remains unclear. This matters because it indicates the new leadership structure is functional despite uncertainty over Khamenei's health and consolidation of power since his March appointment. The assessment comes as the Trump administration pursues military pressure on Iran through Strait of Hormuz operations and potential nuclear negotiations, making understanding Iran's decision-making hierarchy strategically significant.