Houthi forces expand blockade against Saudi Arabian vessels to the northern Red Sea, an area connecting to the Suez Canal for access to the Mediterranean Sea.
The US has signed a landmark agreement with Saudi Arabia to establish a civilian nuclear program, potentially allowing the Gulf ally to enrich uranium.
Houthi forces accuse Saudi warplanes of harassing an Iranian aircraft, warning Riyadh will pay a heavy price if it continues to "violate Yemeni airspace".
