Another way of gaining control over a country through a native puppet was to import children of foreign kings to Nineveh, educate them at the royal court until they had been completely Assyrianized, and then, at a suitable moment, install them on their fathers' thrones. The status and obligations of the puppets in this case too were defined in a treaty:
"As for Ṣidqâ, king of Ashkelon, who had not submitted to my yoke - the gods of his dynasty, himself, his wife, his sons, his daughters, his brothers, the offspring of his dynasty I tore away and brought to Assyria. Šarru-lu-dari, the son of Rukibti their former king, I set over the people of Ashkelon, imposed upon him the payment of taxes and presents to my majesty, and he accepted my yoke." (Luckenbill Senn. p. 30.)
The Assyrian name of this new king, which means "may the king live forever", suffices to make clear what sort of a man he must have been.
Other examples: Sennacherib installed "a native of Babylon who had grown up in my palace like a puppy" on the throne of Babylon (Luckenbill p. 54). Esarhaddon placed an Arab princess, "Tabu'a, raised in my father's palace, to kingship over them and returned her with her gods to her country." (Borger p. 53.) Note also Streck Asb p. 21, referring to nine sons of the king of Arwad sent to Nineveh, robed in purple, given golden bracelets and incorporated in Assurbanipal's entourage.
Simo Parpola
Simo Parpola, 'Treaties with Assyrianized Foreign Royalty', Neo-Assyrian Treaties and Loyalty Oaths, SAA 2. Original publication: Helsinki, Helsinki University Press, 1988; online contents: SAAo/SAA02 Project, a sub-project of MOCCI, 2020 [http://oracc.org/saao/saa02/treatiesasinstrumentsofimperialism/treatieswithassyrianizedforeignroyalty/]