Doing the opposite of how you ensure their non-neutrality as another country.
Don't use them as pawns against Russia, don't get them into NATO, and have Russia sign and respect that - and ensure their borders from Russia and everybody else, fighting for them if necessary (not merely with hypocritical sanctions and condemnations after you've sacrificed them).
Don't use them as pawns against Russia, don't get them into NATO, and have Russia sign and respect that - and ensure their borders from Russia and everybody else, fighting for them if necessary (not merely with hypocritical sanctions and condemnations after you've sacrificed them).