It’s now possible to abort long running operations on AKS clusters. It was released as Generally Available.
For example:
az aks operation-abort --name myAKSCluster --resource-group myResourceGroup
Links:
202304270704
https://azure.microsoft.com/en-us/updates/generally-available-operation-abort-in-aks/
https://learn.microsoft.com/en-us/azure/aks/manage-abort-operations?tabs=azure-cli