The February 2026 US-Israel-Iran regional crisis has affected the financial system. Islamic finance is a $5.98 trillion industry, and because most of its cross-border flows still run on global dollar rails, the shock reaches it through two distinct channels, with the deeper effects set to persist beyond any ceasefire. Building on the April 2026 macro edition that mapped 11 OIC industry clusters and the May 2026 Food & Agriculture deep-dive, DinarStandard's June 2026 Insights Brief turns to Islamic Finance, banking, sukuk, funds, takaful, the financial rails, and de-dollarisation, examining how the crisis flows through each segment across OIC markets.