Nothing will convince Trump to continue the support. He has a personal vendetta against Ukraine due to him being impeached for coercion and the imminent removal of sanctions on Russia, which will provide them massive increase in wealth for their war industry, and the likely complete cessation of military aid to Ukraine by the US is game over for them.
Hard to be cool and patient when your enemy who's objective is the complete destruction of your state and your most influential "ally" are signing your death sentence in Saudi Arabia.