the issue was pretty simple really. trump was intentionally being vague on how to deal with the russia/ukraine war a year ago because his supporters by and large, wanted america to be isolationist. fast forward to 6 months ago trump probably realized that giving concessions to russia would make him look incredibly weak on the world stage. a lot of trump's decision making can be boiled down to serving his own ego and percieved strength by others. so he'll say and do anything to keep up the image even if it means a lot of flip-flopping. biden on the other hand, supported ukraine for more pragmatic reasons which is more of the typical us/european allyship type deals. his hesitance on giving ukraine permissions and access to certain weapons can be argued but he was more consistent and clear on why he supported ukraine.
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