You misunderstood Russia's restraint. You, step by step, corned Russia. Then Russia finally punched back at you when you made the last step to break red line and Russia has nowhere to step back. Russia didn't punch at you on your first step, but it doesn't mean your first step (second step as well ) has nothing to do with Russia's punching back at your last step.
It also applies to Finland. Assume Finland join NATO today and Russia is unable to fight 2nd war against Finland today because of Ukraine war. But it doesn't mean Finland's NATO membership is not the reason why Russia starts war in 10 years on Finland.
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