That's now how weapon acquisition works. Greece has the same level or more control over their Israeli weapons than we have on S-400 or F-16.
Exactly! When you buy weapon systems you pay over the odds, especially when it is clear that you need them. Add to that the current atmosphere of political and military uncertainty; it is not very feasible to pay for weapons in this climate. But when you feel desperate then you have no choice.
Greece mainland with its seas plus Aegean islands with its surrounding seas adds up to 347000 square kilometres. That is half of total Turkish mainland.
No particulars of the Achilles Shield System that Greece is purchasing have been made public. But a system that costs 3.4 billion dollars is not going to be able to give full protection to such a large area.
A radar capable of detecting medium range ballistic missiles like the one in Kurecik will cost well in excess of 1 billion dollars.
To give a rough idea; as a rule of thumb, on a modern AD destroyer like tf2000 the main radar would cost 25% of the vessel’s total cost. That means 0.4billion dollars for a detection range of 400km. To cover that much area would require many of those radars.
In short 3.4 billion dollars is not going to be nowhere enough to give full protection.