President Erdogan of Turkey is theatening to unleash a tidal wave of refugees into the EU. You can read about it here:
To put three million refugees in perspective, when Germany invaded the USSR in 1941 they employed an army of 3.7 million (source - https://en.wikipedia.org/wiki/Operation_Barbarossa). Although Erdogan's "army" of refugees will not be as well trained or heavily armed as were the Germans in 1941, it is likely it will cause considerable damage to the EU.
By the way, this refugee "army" would not exist if it were not for the criminality and stupidity of Obama ad-Dajjal, Hillary, John Kerry, and Samantha Power, none of whom are being held accountable for what they did to Syria.