Stop buying russian oil. Give Ukraine advanced air defense systems not just shoulder launched missles, long range cruise missles able to hit targets using gps and long range accurate artillery. As many armed aircraft and armed drones as Ukraine wants. Feed the co-ordinates to Ukraine from allies of all russian targets in Ukraine. Provide air defense for all nuclear installations in Ukraine, Russia cannot be trusted, warn Russia of this. The amounts of support mentioned above should be more than Ukraine wants.