Why doesn't Saudi Arabia invade Yemen?

Saudi can not invade Yemen. As Kat Hadal mentioned, the coastal cities will be easy to capture, but the mountainous region will be impossible to invade. read more

Saudi Arabia earned 1/3rd of Yemen’s territory in the form of the provinces of Asir, Jizan & Najran (roughly 242,000 km.2 combined.) In exchange, Saudi Arabia promised to not invade Yemen again. A promise they’ve kept so far. read more

The Saudi-led coalition has attacked the positions of the Houthi militia and loyalists of the former President of Yemen, Ali Abdullah Saleh, allegedly supported by Iran (see Iran–Saudi Arabia proxy conflict), in response to a request from the internationally recognized but domestically contested government of President Abdrabbuh Mansur Hadi after he fled to Saudi Arabia. read more