Ezekiel 17:19

‘Therefore thus says the Lord Yahweh, “As I live, surely my oath which he has despised, and my covenant which he has broken, will I even bring down on his own head.”

Behind all that has been said, however, is the fact that Zedekiah and Judah had not only broken faith with Nebuchadnezzar, they had broken faith with Yahweh. What they had done to Nebuchadnezzar they had already done to Yahweh. They had constantly broken their solemn oath and covenant with Yahweh made at Sinai and regularly renewed. The idea is also probably that because Yahweh had committed them to keep faith with their oath and treaty with Nebuchadnezzar that had become part of that covenant. In the end it was for rebellion against and disobedience to Yahweh that these things were happening to them.