Hi,
As per Indian Income Tax Rules, Difference between Fair Market Value and the ESOP Exercise Price will be taxed under the head "Salary" as a Perquisite. Gain/Loss from the Sale of such shares will be taxed as Capital Gains subject to Exemptions and Deductions available. So, from Indian Income Tax perspective, you are liable to pay tax at two stages on ESOP - First as Salary when buying and then as Capital Gains when selling.
From UAE Perspective, you need not pay any Income Tax. However, the availability of Exemption/Refund in respect of tax on ESOPs is subject to the provisions of the DTAA between India and the UAE.
We will have to study the India-UAE DTAA in detail so as to make an opinion in this regard.