But if Putin fails, if Ukraine holds, if this turns into a bloody mess, Putin himself is finished. NATO itself may be finished either way. They have been exposed as being of little value in front of an actual Russian invasion.
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Then the Russian invasion in 1956 of Hungary and the Russian invasion in 1968 of Czechoslovakian proved NATO was finished also?
NATO was formed to stop a Russian invasion of its MEMBERS, not outliers like the Ukraine.
From your lips to God's Ears.