The US, which has previously fought the Wagner group in Syria, says the UAE gave logistical help and air cover to mercenaries accused of atrocities in Libya.
An activist group wants to halt the transfer of British weapons to the kingdom citing concerns that they will be used to commit war crimes in Yemen.
President Donald Trump announced the US will withdraw from the international arms trade agreement at the annual National Rifle Association (NRA) convention and demanded the arms group's support for his re-election bid.
Firearm sales are brisk across the country as weapons dealers lure poverty stricken Yemenis to sell off their personal guns.
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