Saudi Arabia and GCC allies bombing Yemen

[The Mikado]

Of those ten countries, the only significant ones that are close enough and powerful enough to be relevant are S. Arabia and Egypt. Pakistan is too far away and the Gulf States can provide financial support, but KSA and Egypt would do the heavy lifting.

Honestly I like the Houthis' chances of holding Yemen unless Egypt is serious about helping the Saudis in more than a token way.