The only way for these killings to stop is a ceasefire or making peace. Russia hasn't achieved their objectives yet, so I don't see any possibility of a csasfire right now. Same goes for peace, Russia wants to fight for the east of Ukraine and the Ukrainians will not give up any land. At the moment an end of the war seems very unlikely to me.

Western countries have already done a lot for Ukraine, there are large weapon deliveries for Ukraine from all around the world. It seems now that Ukraine is fighting with much more modern weapons than Russia. And without these weapons Ukraine probably wouldn't be able to hold against Russia. So the only option the West has is to increase sanctions and increase weapon deliveries.

The longer the war the harder it will be for Putin, if he can't show any victories. Taking more land in the east would give him a stronger hand in the negotiations. I don't see any quick ending of the war. This could likely go on for the next months.