What is the minimum number of protestors in the streets of Moscow that would allow Putin to withdraw his "Special Military Operation"? Is it 10K, 100K, 250K, or one million?

Moscow had protests of 250K, with Navalny calling people to the streets. So, 250K won’t help.

But a million people — may help.
There were protests in Moscow up to a million people.

If half of the population of Moscow gets to the streets — and stays on the streets, won’t just march for an hour and go home, this will certainly help.

It has to be a spontaneous, popular uprising.
No one can organize it.
It can be only organized by the people who had enough.
And under only 1 slogan: “Enough.”

And after that, more people will drive to Moscow.
Soldiers from the training camps might come to Moscow.

If soldiers join the people in the streets, who refuse to leave, then the regime will fall.