The talks did not collapse. Antony Blinken was called back to West Exec for an emergency work around meeting after the SCOTUS ruling. The ROTUS had already gone to bed.
of course the talks collapsed. The Russians were serious in their demands. Their actual red line has been crossed and they feel an existential NATO threat and belligerence towards them.
They made specific terms and set a one month deadline.
DC started their usual BS of “negotiation” technique. Announce a flat refusal of their demands, but send some DC swamp woman who was supposed to prattle on and on, employ a huge array of diplomats from half of NATO, get a huge budget, and “talk” as the DC agenda proceeds without change.
Offer them some meaningless agreement etc.
DC negotiations are basically, “we aren’t changing a single thing, but we can talk you into liking it”.
Russia is tired of a decade plus of insults, and now of the NATO road show moving right up to their borders. Watch for missile deployments to Cuba and Kaliningrad and every location where they can use INF nukes to menace the EU.
In this case I think they were serious, DC was business as usual, and they have caused more of their same BS. Good old State and DOD doing the neocon thing.