Answer from Islamabad:
Pakistan minister hits out at UAE over Yemen criticism
...Pakistan’s interior minister Chaudhry Nisar Ali Khan hit back on Sunday night in an unusually strongly worded statement, accusing the UAE of “making threats.”

“This is not only ironic but a thought-provoking moment that a minister of UAE is hurling threats at Pakistan. The statement of the UAE minister is in stark violation of all diplomatic norms prevalent according to the principals of international relations,” he said.

“Pakistan is an honored nation and has brotherly emotions for the people of UAE along with Saudi Arabia, but this statement of an Emirati minister is equal to an offence against the ego of Pakistan and its people and is unacceptable.”

Pakistan was the first country to recognize the independence of the UAE in 1971 and the two Sunni Muslim-majority countries have close economic ties.
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Overall, one is left to wonder: OK, the UAEAF has deployed about a dozen of its F-16E/Fs to Saudi Arabia. But, why do they need Pakistani troops if they're so eager to go into Yemen?