You mean this deal? It didn't even include territorial agreements, and Russia started out like:
> One disagreement was over security guarantees. The Istanbul Communiqué said that if Ukraine was attacked and asked for help, the guarantor states would be obliged to help Ukraine militarily. The Russians then demanded this be changed so that the guarantor states would only defend Ukraine from an attack if "all guarantor states" agreed, including Russia. This meant that Russia could veto a military intervention to defend Ukraine from repeated Russian invasion.
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