Therefore thus saith the LORD of hosts, the God of Israel; Behold, I will punish the king of Babylon and his land, as I have punished the king of Assyria.
I will punish the king of Babylon - Nabonidus or Labynitus.
As I have punished the king of Assyria - Sennacherib and other kings (Grotius). (2 Kings 19:35; 2 Kings 19:37).