Former foreign minister Milošoski published the picture taken on Olympus’s highest peak – Mytikas – on his Twitter account on Sunday.
FYROM used the Vergina Sun, a symbol discovered at the tomb of Philip II at the archaeological site of Aigai (modern day Vergina in northern Greece), on its national flag between 1991 and 1995 but agreed under the terms of the 1995 interim accord with Greece to stop doing so.
“Upon entry into force of this Interim Accord, the Party of the Second Part shall cease to use in any way the symbol in all its forms displayed on its national flag prior to such entry into force,” states Paragraph 2 of Article 7 of the agreement.
Milososki told FYROM newspaper Vest that the flag he displayed was a “historic Macedonian symbol.”
“I always carried the flag with the 16-pointed Macedonian sun with me,” said the politician. “Another member of the climbing group had the state flag with them. So we raised both flags at the peak of Mount Olympus and we took photographs with great satisfaction.”
The Greek government described Milososki's actions as a "provocation." The Vergina Star was designated a Greek national symbol by the country's Parliament in 1993.
"We thank Mr Milososki for visiting our country so he could be photographed within Greece, with a Greek national symbol," said Foreign Ministry spokesman Constantinos Koutras.
"We would not encourage him to do the same as this would result in yet another breach of the Interim Accord and the Memorandum on Practical Measures. Provocations may justify Greek positions against all forms of irredentism but they do not help anyone, certainly not FYROM and its people."