Why is there different policies from the USA for Turkey vs Greece/ India? [closed]

Question

• Russian S-300s used by 3 NATO member countries

According to the above link, the Russian S-300 missile defense system is being used by three NATO countries: Greece, Bulgaria, and Slovakia.

• the USA ‘welcomes’ Greece’s interest in buying the F-35

According to the above link, the USA is welcoming Greece's decision to purchase F-35.

• How does Turkey's purchase of the S-400 anti-air system jeopardize the F-35?

According to the above link, the USA is worried that Turkey using S-400 and F-35 at the same time would give Russia the opportunity to collect data on F-35.

• No blanket waiver of CAATSA sanctions for buying Russian/Chinese arms, but India safe, says the US

According to the above link, the USA is soft in India for buying S-400.

Now, I have two questions here:

1. Since, Turkey is officially expelled from the F-35 project, why has the USA sanctioned Turkey for S-400?
2. Why is the same attitude as Turkey is not visible in the case of Greece and India by the USA?

Answer 1

• Turkey is a NATO member. There used to be an understanding that all NATO members stood together against the Soviet Union. Russia isn't the Soviet Union, there is a new Cold War brewing, so a NATO member buying from Russia is seen as more serious than a third party buying from Russia.
• Turkey has access to classified NATO information. Presumably, Russian experts would have to look at the Turkish air defense system to integrate the S-400, and the rest of NATO is afraid that these experts might learn NATO secrets.