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US can force Microsoft or Google to pull out of UK in the same way Russian government can force Gazprom to stop selling gas to Germany. Again it's unlikely in current geopolitical situation but imagine that fascists or communists come to power in US (both are non zero probability). If there is one thing that history teaches us is that alliances are unstable.

Also US can easily force McDonalds to pull out of Russia - CEO and leadership live in US and have to comply with US sanctions unless they want to pull Lavabit or spend time in jail.