How can Trump end the war? Answer: Convince both sides that continuing the war is futile - that it will not change the situation on the ground and will achieve nothing but more loss of life. Demonstrate to both sides that you will do all in your power as President of the United States to ensure that it will remain a stalemate. If one side tries to gain an advantage on the ground, provide the other side with the ability to resist such efforts.
In pursuit of that strategy, sending Ukraine defensive weapons, to counter Putin’s clear intention to push for more territorial gains, is the right move.
Probably.