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What about arming and aiding a terrorist organization who is fighting with your NATO ally? Does this qualify?

Depends a bit on whether those weapons have internet access.

We used to pay people handsomely to get our hands on Russian weaponry to play with.

How are buying weapons from Russia grounds for expulsion from Nato?

NATO was formed as a deterrence against Russian aggression. To then buy weapons from them is a pretty big conflict of interest.