The plan was announced as Greece remains locked in a tense dispute with Turkey over maritime boundaries and energy rights in the eastern Mediterranean.
Turkey has a research vessel doing surveying work in waters claimed by both countries, which sent warships and held military exercises in the area.
The planned extension along Greece’s Italy-facing coastline would not directly affect the territory at the centre of the Greek-Turkish dispute. But Mr Mitsotakis told the Greek parliament that Greece is abandoning decades of “passive” foreign policy.
