Not as common as you seem to think. Britain, Spain, Germany and Italy all use the jointly developed Typhoon. Sweden and France also design and build their own fighter jets, and France has its own independent nuclear arms.The military planes that stock the air forces of Europe mostly come from the US. They are almost certainly fitted with kill switches for the event that the US is hostile with that country. Likewise, every computer/server installed in every army/navy/air force HQ, tank, ship, civilian police, political institution etc, etc.
Europe is now frantically resupplying with equipment from China to mitigate the threat from the US aligned with Russia.
Strange times.