It's the third time this month that that the US has downed aircraft affiliated with Syrian President Bashar Assad’s government.
Devastating conflicts, violence and persecution in places like Syria and South Sudan had left a record 65.6 million people uprooted from their homes by the end of 2016.
Doha has long faced accusations that it is a state sponsor of terror.
A suspected cholera outbreak is spreading quickly in war-ravaged Yemen, with an estimated 3,000 to 5,000 new cases every day.
The European Commission sees synchrotron support for investment in science as contribution to peace and stability.
US President Donald Trump is currently in the Kingdom to seal deal.
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