I have given all these lands into the hand of Nebuchadnezzar “God is the sole lord and proprietor of the world; and, by virtue of his absolute sovereignty and dominion, has a right to give the kingdoms of the earth to whomsoever he pleases, Daniel 4:17, and he exercises this authority by changing times and seasons, by removing kings, and setting up kings, Daniel 2:21. The king of Babylon, my servant One whom I have made use of as an instrument to execute my purposes in inflicting punishment on many nations: see note on Jeremiah 25:9. And the beasts of the field have I given him This is a hyperbolical way of speaking, to signify the most ample authority and dominion.
Related Commentaries of Jeremiah 27:6
Jeremiah 27:6
6 And now have I given all these lands into the hand of Nebuchadnezzar the king of Babylon, my servant; and the beasts of the field have I given him also to serve him.