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In return for Iran scaling back its nuclear activities, international sanctions were lifted and the country was allowed to sell its oil and gas across the globe.
The end of the embargo means Iran is now able to buy and sell arms, including missiles and tanks, although the country is still crippled economically from US sanctions.
In May 2018, the US unilaterally withdrew from the accord, and has since failed in its repeated attempts to petition the UN to reimpose a raft of sanctions against Iran.
A separate EU and UK ban on weapons deals with Iran is set to remain in place until 2023.
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