The red line attack on Russia's nuclear capabilities has to present a credible and deliberate threat to Russia's nuclear strike capacity.

Operation spider web was attack on Russian airfields primarily to reduce capacity to bomb Ukraine.

You can't nuke a country for hitting some nuclear strike capabilities you're using to conventionally bomb them.

that didn't cross the red line, and the US has a phone call to talk it over and that Russia's policy for using nukes hadnt been breached