It's the third time this month that that the US has downed aircraft affiliated with Syrian President Bashar Assad’s government.
Talks on Britain leaving the European Union began Monday with both sides saying they will focus first on an orderly withdrawal.
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.
The leaders of the Greens and Socialists penned a joint letter to EU Council president Donald Tusk condemning the current strategy of trying to keep new migrants out.
EU officials do acknowledge that the agreements to be reached before Britain leaves in March 2019 can only be concluded as a whole package simultaneously.