I'm going into IR PhD, I know that's not how IR works. Saudis give Pakistan a couple billion, Pakistan votes for Saudi policies in the region and at UN.
But this is going to blow up in Pakistan's face. Remember '91? Pakistan put a couple brigades bordering Yemen, and in defensive locations going towards Mecca and Medina. It was a smart idea.
If after spending Hundreds of Billions of dollars and training hundreds of thousands of Saudi soldiers/ airmen/sailors/ Intel agents the House of Saud is still not confident in their abilities you have a BIG *** problem.
There are other options available to Pakistan other than deploying forces into Yemen.
1. Pakistan/ GCC can blockade Yemen's coast. Forbidding weapons for being shipped.
2. Pakistani forces in defensive stance, with a clear declaration, if Pakistani soldiers are killed by cross-border raids Pakistan will engage with full force.
3. Using what-ever Pakistani influence is remaining to pressure Iran and GCC to stop funding the conflict.
4. Providing Pakistani facilities to negotiate peace.
AQAP is a bigger problem than the Houthis. Houthis has a self-serving interest to stay alive, AQAP think's they'll get 72 virgins if they blow themselves up.
This is an internal Yemeni conflict. Pakistan has it's own internal/regional conflict that it itself hasnt completely gotten a handle on.
