Ukraine did not have, does not have and will not have a chance in confrontation with Russia. Any tactical success is simply an increase in the number of deadweight losses
So what's the difference between a "confrontation with Russia", where Ukraine never has a chance and a "tactical success" like, for example, defending their Capital city from Russia or recapturing hundreds of square miles of land that Russia had occupied for months.
What do you think the worst case scenario for Russia is 1 year from now?