Of the 21 summers I've spent in Greece there have 21 major fire events which are primarily dealt with by their own Canadair and Puma fleets supplemented with externally contracted rotary wing aircraft - mainly Skycranes from the US, but Russia, Germany and Italy have been known to offer their hardware (Mil, MH).
There is not much of a private helicopter industry in Greece, and I would not imagine they would put up barriers to any foreign group who is able to assist them in their economic development.