GOP Platform Members: What Happened to Arms Help for Ukraine?

This WaPo article said Trump intervened in one issue during the week of putting together the GOP platform: Ukraine.
Specifically, the Trump camp did not want the platform to call for providing arms to Ukraine to defend themselves against Russian aggression.
Most conservatives want to help defend Ukraine. Why doesn’t Trump? Perhaps, his advisors and his own view of the world is that Putin isn’t a threat or that Ukraine isn’t our problem.
Ukraine watchers are worried and I believe Trump supporters among the committee should provide an explanation for their vote.