Ukrainian forces are faced with an extremely difficult task of fighting well-armed terrorists while protecting civilians. Modern American military has a number of high tech devices that would allow to fight terrorism more efficiently while avoiding civilian causalities. Those are powerful sniper rifles with night/heat vision, drones and other devices that can be used to gather intelligence, etc.
United States has suffered from terrorists greatly. It should remain a champion of resisting terrorism all over the world. The help Ukraine needs would be a drop in the sea of the US defense budget, and would save millions of people in Eastern Ukraine from terror, and thousands from death.