If you want to convince Republicans to support Ukraine, the best way is to put it in terms that appeal to them:

• It’s a jobs program. The more weapons we build for Ukraine, the more jobs we create in the defense industry.
• It saves money. By getting Ukrainian soldiers to fight on our behalf, we destroy Russia at a fraction of the cost of fighting them ourselves directly.
• It clears out our old inventory of shells and missiles which we would have to dispose of anyway, allowing our troops to get the newest and best.
• It gives us access to extremely valuable real world testing. Ukrainians have developed new tactics using modern equipment (especially drones) that have rendered tanks and even several types of naval vessels obsolete.
• It sends a message to the whole world that America is still powerful and it’s not going anywhere. One of the most pernicious elements in the Republican Party is a core of doves who would willingly surrender the world to dictators. Supporting Ukraine and Taiwan is the strongest challenge to those cowards.

That last one should especially be aimed at MAGA types. There is no path to American Greatness that involves retreating from the world stage.