There’s a slight difference between:

• Helping an underdog that got invaded. While the invading force is by the way one of your worst enemies that the sent gear was prepared for anyway.
• Further financing of a state that already has full capabilities to wipe the floor with a largely irrevelant country.

Not really, every bullet fired in ukraine weakens russia, an invading country and therefore it hurts soldiers.

The war in palestine kills innocent civilians and children