Houthi forces impose naval blockade on Saudi Arabia, forcing several oil tankers to change course in the Red Sea.

On the 20th, Houthi armed forces in Yemen announced the implementation of a "naval blockade" against Saudi Arabia, which took effect immediately, warning ships not to sail to Saudi ports. According to the latest ship tracking data, on the 22nd, five oil tankers changed their routes in the Red Sea, with two of them setting the Suez Canal as their new destination. It is reported that the EU's military operation in the Red Sea - "Operation Shield" issued a navigation warning on the same day: ships associated with Israel, the United States, and Saudi Arabia are at a higher risk of being attacked by Houthi armed forces. It is recommended to avoid the Red Sea and the Gulf of Aden routes until the risk decreases. The announcement also stated that ships currently docked at Saudi ports and loading and unloading goods should reduce the range of their electronic signals, try to shut down their automatic identification system signals, and minimize the exposure of public digitized information that can be locked onto.