The United States and Iran exchanged defiant messages ahead of Monday's scheduled announcement of new US economic sanctions that could impact the Islamic Republic and Tehran's most important trading partners including China.

US treasury secretary vows Washington will 'collapse' Islamic Republic regime, promises toughest sanctions yet; US targets Hezbollah with new sanctions, emphasizing ties to Tehran

Trump escalates economic measures against Iran, impacting China. Iran reconstruction funding in a US-Iran deal by 2026 at 18.5% YES.

Iran warns of a devastating response as the US prepares tougher sanctions, while falling oil flows through Hormuz raise concerns over global energy supplies.