According to a report by the English-language Saudi Arabia's Arab News, the campaign began when the Turkish Foreign Ministry announced that the agreement between Cairo and Athens was "invalid", and that the area it covered was within the scope of Turkey's interests, claiming that it had "violated the Libyan maritime borders."
This Turkish-Brotherhood campaign came amid a controversial background for Turkish energy exploration in the eastern Mediterranean.
"It is surprising that such statements and allegations were made by a party that does not know the agreement and its details," said the Egyptian Foreign Ministry spokesman, Ahmed Hafez, in a tweet.
The Turkish statement was followed by a series of attacks by the Muslim Brotherhood on social media, criticizing the agreement and accusing Egypt of plotting against Turkey.
Dozens of Brotherhood websites that launched from Turkey published fabricated reports and photos attacking the agreement.
Various experts and officials denied the claims made by websites and social media accounts, which claimed that the agreement between Egypt and Greece to demarcate the border gave the green light to the Israeli gas pipeline, EastMed, to export gas to Europe.
According to former Egyptian Assistant Foreign Minister Mohamed Hegazy, the reason for Turkey's anger is that after this deal, in addition to the signing of the border demarcation agreement between Greece and Italy, Turkey no longer has a free entry point into Libya in line with the rules of international law.
He added that the Secretary-General of the United Nations refused to deposit the maritime agreement that Turkey concluded with the government of Fayez al-Sarraj in Libya, and that the Libyan parliament did not adopt it.
The agreement between Egypt and Greece comes two months after the latter signed a similar agreement with Italy regarding the demarcation of the exclusive economic zone between the two countries in the Ionian Sea (a branch of the Mediterranean).
"The Turkish allegations are based on its lack of recognition of Cyprus, and thus its failure to recognize its maritime borders," regional security expert Muhammad Jumaa said in a statement to Masrawy.
For his part, Egyptian Foreign Minister Sameh Shoukry said that this agreement allows Egypt and Greece to move forward in increasing the utilization of the resources available in their exclusive economic zone, especially oil and gas reserves, and opening new horizons for more regional cooperation in the field of energy, especially that the two countries are members of the Eastern Mediterranean Gas Forum.
"The demarcation of the maritime borders between Egypt and Greece cancels Turkey's agreement with al-Sarraj government, as it covers some of the areas covered by that agreement," said Professor Clianeth Kyriakides, a professor of security and strategy studies.
Under the agreement, Egypt will be able to explore for oil and gas in the western economic zones located on the maritime borders with Greece, and it will also give the right to Egypt and Greece to search and explore in the eastern Mediterranean, and to strengthen bilateral relations between Cairo and Athens.