But USA is our ally. Greece is in NATO, right?
I think you missunderstood NATO,
NATO
is a Defencive coaltion, and created after WW2, so to create a coalition to defend against any USSR offensive action,
and NATO has 2 faces,
It happened to work for 1, the humanitarian one,
the one that designs bridges, roads airports powerplants hospitals etc,
the other face is trully military,
Now NATO treaties and agreements are Strange,
for example at 1974 and Cyprus,
a possible war among Greece and Turkey that time is out of NATO business,
cause NATO has no right to defend one or another of its members when they have war,
that is why although Greece was from the first NATO members, left NATO at 1974,
cause interfear to our inner policy, as dictatorship,
but reenters NATO political part quickly, but not at military part which happened decades after,
so as you see NATO also is divided to political and military part,
someone can be political members, but not military one,
NATO also is using standard weapon and forces,
for example in my country there are brigades that are according NATO standards, and ready to work-cooperate with rest NATO forces,
but there are also brigades outside of NATO stantards to defend the country from a possible NATO member attack.
NATO has also a secret face, the attacking one,
which finds me negative,
cause the goal of NATO is the reason that was created,
to defend any member from ex-communist attack, like in Korea, or today from any Russian or Chinese attack,
but in NATO treaties, war among its members is possible, and in this case the rest countries must stay neutral.
so about Greece,
Yes it is an ally of NATO, as concerns the defencive subjects of the alliance,
but also has army outside NATO as concerns the defencive subjects from an ally,
and the offcial dogma is no participation to offencive acts of NATO,
do I cover you?
it is like Denmark or England and EU,
England is a EU member, but a Eurozone member, at least until today
and Denmark is mostly at EC times than to Fiscal EU of today,
to make clear my shelf,
if for example S Korea attacks N Korea,
Greece is not obliged to send troops.
but if N Korea attacks S Korea,
Greece is obliged to send forces,
and if for example a war among, lets say Portugal and Spain happens,
Greece must stay neutral.
That is the Basical dogma of NATO,
and not to serve USA,
it gives freedom to act, or stay neutral,
but also obligations,
NATO is not USA,
for example if Russia attacks Czechia or Polish republic, NATO members are obliged to send forces and help,
but if USA wants to sent troops or tanks there, at peace time, members are not forced to do such,
it is a defencive alliance, not an offencive,
to understand NATO
search the Cyprus 1974 case
and the Falkland war at 1982
and there might be a new NATO political problem at Syrria these days,
for example how the alliance should act if Russians shot down Turkish airplanes,
or the oposite Turks shot down Russian planes, in a land outside NATO orders as it is today Syrria.
for example shooting a Russian plane at Syrria, can be an attacking act of a NATO member?
or shooting down a Turkish plane above Syrria, not inside Turkish borders, can be considered as an attack against a NATO country?
the above questions are the political/diplomatic part of NATO,
and are not to be solved by me and you,
so do not bother to answer,
they are just retorical questions to make you think,
we can not solve them, and is not our busineess to do so.