The promise to Ukraine was that they are going to be protected by their chosen gang rather than be cynically used to try and take down a rival gang.

The lie was laid bare once they were actually attacked. Article 5 protections - the only reason they are fighting this war - came off the table as soon as it became clear that the rival gang wasn't going to be taken down.

Quick essay for 30 points: write to a grieving mother campaigining against gangs explaining why even though her son joined the crips for protection and got murdered by a blood in the initiation phase, she needs to STFU about kids staying out of gangs. The reason is simple: she needs to STFU because several other 14 year olds who joined the crips for the promise of protection haven't yet had that promise tested.