Waves of migrants are gathering at the Greek-Turkish border in an effort to get into the EU amid a decision by the Turkish president to no longer try to prevent migrants and refugees from attempting to reach Europe.
The Turkish authorities have accused the bloc of not living up to promises it made under a 2016 deal.
Greece, where more than 40,000 immigrants have already taken refuge in severely overcrowded camps, called the looming influx a national security threat.
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