Ways to let NATO attack Russian troops in Ukraine and Belarus

NATO requires unanimity. Ukraine is not a member of NATO.
One possibility:
1. Make them a member now.

2. If any NATO member refuses to approve that, let the rest terminate the vetoer’s membership.

3. What is stopping us from helping Ukraine against Belarus? They are not Russia. 

4. NATO has used military force in Bosnia and Afghanistan, neither of whom were members.

5. Russians in Ukraine are trespassing. Seems there is a difference between attacking Russia and attacking Russians who have invaded a peaceful neighbor for the purpose of stealing that nation from its people.