There is nothing worth discussing with Greece at the moment President Recep Tayyip Erdogan said, as he warned that Turkey may retaliate against Athens' violations.
Speaking at the inaugural meeting of the European Political Community, Erdoğan criticized Athens for basing its policies on "lies."
"They are not where they are supposed to be," the president told a news conference in Prague. "Their entire policy is based on lies, they are not honest. We have nothing to discuss with Greece."
Erdogan said Athens understood Ankara's message when Turkish officials said "we may suddenly arrive one night" – a comment that Greek and some other Western officials have criticized as a threat to a neighboring state.
The next day, Erdogan criticized Mitsotakis for seeking U.S. assistance amid ongoing tensions with Turkey, saying "we will continue to do what is necessary."
"The Greek Prime Minister is seeking help from the U.S. Against what? Against Turkify. Whatever you do, we will continue to and are ready to do whatever is necessary," the president told a conference marking the week of the Prophet Muhammad's birth in the capital Ankara.
Greece and Turkey have been at odds for decades over a range of issues, including where their continental shelves start and end, energy resources, overflights in the Aegean Sea and the illegally occupied island of Cyprus.
Relations between the two neighboring countries and fellow NATO members have deteriorated in recent years.
In May, Erdoğan cut ties with Mitsotakis and declared all other channels of communication between the countries closed.
Erdogan said Mitsotakis "no longer exists" for him, after the Greek premier lobbied to block sales of F-16 fighter jets to Turkey during a visit to the United States.