The resignation comes after a joint investigation by European media outlets said despite public denial, the EU border agency was involved in illegal pushbacks of asylum seekers in the Aegean Sea.
The European Union agency deployed at the Greek border is failing to hold itself accountable for abuses, NGOs say.
A series of leaks directly implicate FRONTEX and multiple EU member states in taking part in pushbacks in the Aegean Sea in support with the Greek Coast Guard.
European countries see the summit is all the more important as the United States "disengages" from the region while Russia and China make inroads.
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