It's really strange how confidently people insist that Ukraine cannot win against Russia, as if history weren't full of examples of much weaker parties prevailing against vastly more powerful opponents.

Japan, Poland, Finland (twice), and Afghanistan prevailed against the Russians. Even the Chechen separatists managed to force a Russian withdrawal in the First Chechen War.

The Taliban are back in power after a multi-decade effort by a global military coalition to remove them.

Vietnam defeated France, the United States, and China.

A younger version of Ayatollah Khamenei is still ruling Iran, despite two nuclear powers depleting their stand-off weapons to achieve a regime change.

The Spanish defeated the Muslim invaders after an 800 year struggle...

There are many other examples.

Should Israel have just given up in 1948? The odds seemed stacked against them. What about the American colonies, the Irish, or the Algerians in their struggle for independence?