Here's the official statement via James Bottomley

Posted Oct 24, 2024 20:24 UTC (Thu) by dskoll (subscriber, #1630)
In reply to: Here's the official statement via James Bottomley by backdoordriver
Parent article: Several Russian developers lose kernel maintainership status

Cannot find other words different from "racism".

Really? You are not trying very hard. The sanctions against Russia are in response to an unprovoked war of aggression against Ukraine. It has nothing to do with anyone's race.

As for your questions:

Why such guys cannot contribute in their hobby time ?

They can. But Linux Foundation can't have anything to do with people working for sanctioned entities.

Do such guys decided to start the war ?

Probably not. But again, the rules of the sanctions prohibit working with people who work for sanctioned entities. This may be an unfortunate bit of collateral damage, but such is life.

Is Linux a USA product or something where all able to contribute did ?

Linux is not an American product, but any organization operating in the United States, and any people living in the United States, have to comply with American law.

Should USA government rules over Linux ?

No. But it can enforce its own laws on people and organizations located in the United States.

Will such racist sanctions change the war result ?

That's a meaningless question because the sanctions are not "racist". They are designed to punish Russia for starting and engaging in an unprovoked war of aggression against its neighbor.