"I am not giving in to the threats of the Turkish authorities who said to us again that unless the agreement on visas is reached, the refugees deal will have to be reviewed. If Turkey does not fulfill its obligations, there will be no advancements on the visas agreement," Juncker told Le Soir newspaper.
According to the deal finalized in March, Turkey agreed to take back all undocumented migrants who come ashore in Greece if EU countries have Syrian refugees resettled from Turkish camps on a one-for-one basis.
The bloc also promised to accelerate the Turkish EU accession and introduce visa-free regime once Turkey had met the 72 conditions set by the bloc. Ankara has not fulfilled the five conditions that relate to data protection and anti-terror laws so far.