Turkey will not implement the Turkey-EU deal on stemming the illegal flow of migrants to Europe unless the 28-nation bloc fulfills its side of the agreement, President Recep Tayyip Erdoğan said in a speech at the Presidential Palace in Ankara on Thursday.

The EU and Turkey reached an agreement in March to reduce the worst migration crisis that Europe has seen since World War II with EU countries tightening checks on the migration flow and sending refugees who arrive in Greece back to Turkey in exchange for legally processed refugees.

In return, Turkey is bounded to receive benefits including visa-free travel for its citizens to the EU's Schengen zone, which in the accord is promised at the latest by June 2016, together with receiving a total of 6 billion euros up to the end of 2018 to spend on meeting Syrian refugees' needs in Turkey.

"There are precise conditions. If the European Union does not take the necessary steps, then Turkey will not implement the agreement.

"Everything that has been promised [must be put into action by the EU], everything that is specified under the accord," Erdoğan said.

"Some 3 million people are being fed on our budget," he said, referring to Syrian refugees. "There have been promises, but nothing has come for the time being."

He said Turkey has no right to turn a deaf ear to humanitarian crises in the region, stressing that the country has embraced those victimized by barrel bombs and airstrikes since the beginning of the Syrian civil war.

He said all the leaders that he talked with at the Nuclear Security Summit in Washington last week told him that no country could do such a thing without support.

"We have received lots of thanks for our action on the refugees and in the fight against terrorism. But we are not doing this for thanks," he said.

The first group of migrants from the Greek island of Lesbos was bound for the Turkish town of Dikili in the western province of İzmir on Monday. Three vessels docked in Dikili with 202 migrant passengers on board, mostly from Pakistan and some from Bangladesh. The migrants were later transferred to the northwestern province of Kırklareli.

The European Commission on Monday said Turkey had met the legal requirements for taking back migrants sent from Greece. Asked about whether Turkey had met all the requirements for the first boats of migrants arriving on Monday to be "legally sound," a spokesman for the EU executive said: "Yes."

Officials from parties to the migration agreement have said that the deal has started to show significant results.

In a joint press conference with Finnish Prime Minister Juha Sipilä during an official visit to Helsinki on Wednesday, Prime Minister Ahmet Davutoğlu said the number of illegal migrants arriving in Greece from Turkey in a day had fallen to 350 in the last two days, which shows that the readmission agreement was working. According to Davutoğlu, this number was around 6,000 in October.

Turkey has taken in at least 2.7 million Syrian refugees and houses 270,000 in 26 provisional refugee camps with food, health and education services as well as psychological support, vocational education and social activities.

With the largest number of Syrian refugees in the world, the country has spent more than 7 billion euros meeting their needs, according to European Commission figures released last year.

Over the past year, hundreds of thousands of refugees have crossed the Aegean Sea to reach Greece. This has placed a huge strain on the austerity-hit EU member and threatened the EU's internal open-border system, as countries to the north of Greece impose border restrictions.