Its possible for a nation to overestimate their military might. Look at some of the US’s embarrassing wars when they were forced into Guerrilla warfare. But there are still limits. There is no way russia thinks they can beat Nato in a conventional war. Its why their strategy is around developing technologies that maintain nuclear effectiveness (though I think anyone looking at the numbers has to have some serious doubt about how nuclear capable russia really is).
Because they don’t want to lose
At no point has that stopped them in past military endeavors, including in Ukraine?
Its possible for a nation to overestimate their military might. Look at some of the US’s embarrassing wars when they were forced into Guerrilla warfare. But there are still limits. There is no way russia thinks they can beat Nato in a conventional war. Its why their strategy is around developing technologies that maintain nuclear effectiveness (though I think anyone looking at the numbers has to have some serious doubt about how nuclear capable russia really is).