Saudi Arabia listed the 86-year-old Brotherhood along with several other groups, including al-Qaida affiliates, as terrorist organisations on Friday.
Those who join or support the groups could face five to 30 years in prison under the new Saudi policy.
The Gulf moves against the Brotherhood follow an Egyptian decision to label it a terrorist organisation in December. The move by the military-backed interim government in Cairo comes amid a crackdown on the group following its July ouster of the country's first elected president, the Islamist Mohammed Morsi.
Egyptian authorities have produced little evidence showing a direct Brotherhood link that is open to public scrutiny, and most of the attacks have been claimed by a Sinai-based militant group.
The Western-allied UAE, a seven-state federation that includes the cosmopolitan business hub of Dubai, said it will cooperate with Saudi Arabia to tackle "those terrorist groups through liquidating all forms of material and moral support."
"The significant step taken by (Saudi Arabia) in this critical moment requires concerted efforts and joint collective work to address the security and stability challenges that threaten the destiny of the Arab and Muslim nation," the UAE said in a statement carried by official news agency WAM late yesterday.
The Brotherhood condemned the Saudi move against it Friday as a "complete departure from the past relationship" with the kingdom and insisted that it does not interfere in matters of other nations.
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