What if this was a much more sophisticated operation behind this? Russia would have an interest to blow up pipelines, just not their own. It may just be that NATO detected Russian mines on other pipelines and then moved them to NS1+2. Russia then blew up their own pipeline thinking it was Norway's pipelines. See my post here with some more thoughts about this scenario.
RE: Ukrainian forces continue pushing forward! Russia blamed for nordstream one and two sabotage.