Greek Foreign Ministry instructed its ambassador in Ankara on Monday to lodge a protest with the Turkish government against what it considers illegal fishing by Turkish fishermen in Greek waters.
In recent times, there have been repeated incidents of this kind, some of which have been documented with videos.
Some Turkish trawlers operate closer than 3 nautical miles (5.6 kilometres) from Greek islands and have clashed with Greek fishermen there. According to Greek media reports, some of them were even accompanied by the Turkish coastguard.
On the Greek island of Leros, the fishermen occupied the town hall last week and demanded that the government take action.
“Illegal fishing in Greek territorial waters, in addition to being another violation of international maritime law by Turkey, is also a violation of European law,” Greek Foreign Minister Nikos Dendias said on Monday.
He also condemned the “reprehensible practice of the Turkish coastguard escorting Turkish fishing boats and harassing Greek fishermen.”
The Greek side is obliged to defend its rights and not leave any challenges unanswered, Dendias warned.