I've read that point, and in my view it contains an obligation to call for a UN Security Council meeting and to seek a certain action by it.

The GP said:

>> The memorandum also said they would provide assistance

The memorandum does not contain an obligation to "provide assistance". "Providing assistance" and "seeking UNSC action" are very different things.

>> they are not keeping that promise.

They are not keeping promise to "provide assistance" because they have never made that promise.