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Everyone responding to you here is wrong.

It's not "seen as an attack by Russia on NATO" because per the NATO treaty Russia nuking Washington DC won't be "seen as an attack" either, that is, until the country being attacked officially declares it as such through the mechanisms the treaty outlines.

The Czech republic hasn't invoked that mechanism, therefore it's a non-event as far as NATO's concerned. NATO doesn't have any mechanisms for pro-actively monitoring attacks on member states, outside of those states themselves.