It's not that hard and even no troops required. Send more weapons without restrictions to use them against Russians, tight real sanctions and they will be defeated
First russians came for Ichkeria and I did nothing because I'm not a Chechen.
Then russians came for Georgia and I did nothing because I'm not a Georgian.
Then they came for Ukraine...
We don't need to fight. We only need to hand over to Ukraine the weapons they have been asking for since 2022. A few Taurus with the gloves off and Ukraine instantly gets far closer to prevent Russia from continuing their whole war effort.