It’s not my fault you don’t understand the entire range of diplomatic options in the range from “sitting silently” to “ground invasion”. However, I would refer you to any country with a diplomatic department of any kind, which is all of them. They can probably instruct you on some of the options available.
How can the UN and Israel trade blame? Is the UN setting up checkpoints to turn around Israeli aid? Is the UN destroying NGO convoys even though they’ve been informed they’ll be going into Gaza?