Erdoğan hardens tone over Greek arms build-up as ‘Achilles Shield’ raises tensions

September 3, 2026
Written by E.Tsiliopoulos

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Erdoğan hardens tone over Greek arms build-up as ‘Achilles Shield’ raises tensions

Greek-Turkish relations appear to be entering a more difficult phase, as Turkey reacts sharply to Greece’s accelerating military modernization and the deepening of its defense ties with Israel. The agreement surrounding the so-called “Achilles Shield,” Greece’s new air-defense architecture, has added another layer to tensions that had already been building in the Aegean and Eastern Mediterranean.

Turkish President Recep Tayyip Erdoğan has responded forcefully to Greece’s defense spending, while Ankara has once again raised longstanding claims over the demilitarization of Greek islands and the existence of so-called “gray zones” in the Aegean. The rhetoric marks a notable departure from the more conciliatory atmosphere that followed the signing of the Athens Declaration in December 2023.

From Ankara’s perspective, the “Achilles Shield” is not simply another Greek procurement program. Turkey sees the development as a potential shift in the military balance in the Aegean, particularly because it is linked to Greece’s expanding strategic and defense relationship with Israel. That relationship has generated growing concern in Ankara and among parts of the Turkish public, adding to domestic pressure on the government to take a tougher stance toward Athens.

Erdoğan’s warning from across the Kastellorizo channel

The most striking element of Erdoğan’s latest intervention was his reference to Kaş, the Turkish coastal town directly opposite the Greek island of Kastellorizo.

“If we were to send a message from Kaş to Greece, they would hear it, wouldn’t they?” Erdoğan said, linking his criticism directly to Greece’s military buildup. He accused Athens of pursuing the “wrong path” by strengthening its military presence on the eastern Aegean islands, despite what he described as Ankara’s efforts to maintain good relations.

The comments represent a clear shift in presidential rhetoric compared with the period following the Athens Declaration. More importantly, they do not appear to be an isolated incident. They form part of a broader series of Turkish moves that have gradually brought almost all of the traditional disputes between the two countries back into focus.

Athens, for its part, has so far avoided responding in kind. The Greek government continues to emphasize the importance of maintaining open channels of communication and dialogue with Turkey, without accepting Ankara’s claims. Rather than engaging in a public war of words, Greece has sought to respond primarily through diplomatic channels.

Foreign Minister George Gerapetritis has said that Athens has sent a formal diplomatic note to Ankara over Turkey’s maritime spatial planning and its own moves concerning marine parks in the Aegean and Eastern Mediterranean. Greece has made clear that it will continue to address Turkish claims and actions through diplomatic means, including those concerning the sovereignty of the Greek islands.

The diplomatic exchange has now become effectively two-sided. According to the Turkish newspaper Milliyet, Ankara has also sent a diplomatic note to Athens concerning Greece’s marine parks and maritime spatial planning, warning that Turkey would not accept actions that, in its view, alter the status quo in the Aegean.

The issue moves to Brussels

Greece is also attempting to raise the issue at the European level. During an informal meeting of EU foreign ministers in Wicklow, Ireland, Gerapetritis briefed his European counterparts on developments in the Eastern Mediterranean and Aegean, including Turkey’s moves regarding maritime zones and marine parks.

“I had the opportunity to brief my counterparts on the situation in the Eastern Mediterranean and the Aegean and on issues relating to violations of international law,” Gerapetritis said after the meeting. He stressed that Greece would accept “no retreat” concerning its sovereignty and sovereign rights, while expressing confidence that any aggressive action would trigger immediate European solidarity.

The central question now is whether the renewed confrontation will remain confined to statements, diplomatic protests and navigational warnings, or whether it will once again spill into the field.

Turkey has already issued NAVTEX notices for research activities in the Eastern Mediterranean, while Athens is closely monitoring developments as it prepares to advance its own initiatives.

One of the most sensitive tests will be the Greece-Cyprus electricity interconnection. If work related to the future laying of the cable resumes, the project could once again bring the two countries’ competing interpretations of maritime zones into direct contact. Greek government spokesman Pavlos Marinakis has reiterated that the project will proceed in accordance with international law.

At the same time, particular significance has been attached to the meeting between Greece’s intelligence chief, Themistoklis Demiris, and the head of Turkey’s National Intelligence Organization, Ibrahim Kalin. The intelligence channel is one of the mechanisms that Athens and Ankara have sought to keep open even during periods of heightened political and diplomatic tension, precisely to reduce the risk of an uncontrolled escalation.

The “Achilles Shield,” therefore, has not created the latest tensions between Greece and Turkey on its own. Rather, it appears to be accelerating a process already underway, involving marine parks, maritime spatial planning and the revival of longstanding Turkish claims.

Ankara’s reaction to the deepening Greek-Israeli defense relationship adds another significant variable to an already complex equation.

After a prolonged period in which Athens and Ankara sought to keep their differences away from direct confrontation, the coming months could prove decisive. Marine parks, NAVTEX notices and, above all, the Greece-Cyprus electricity interconnection will test whether the latest escalation remains confined to rhetoric and diplomacy—or whether Greek-Turkish relations are entering a new period of confrontation on the ground and at sea.

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