I'm with T28B on this, NATO countries are able to take out Russia without NBCs, and I believe that a conventional response is the initial response agreed in houses I have no access to. It will be sufficient if no more WMDs are used and it will give a moral high ground that no money could buy. Not to mention the humiliation to Putin if losing with nukes to the western conventional means.
If Vlad the Mad keeps on throwing buckets of sunshine or chemicals it will be a different story.