This will not help Ukraine in any way... And Buffett will make a profit, as while the court process continues, the shares of the mentioned companies will lose value, allowing him to buy them cheaper.

📰American lawyer Mikal Watts and the law firm Baker & Hostetler, which belongs to Warren Buffett, filed lawsuits on behalf of the citizens of Ukraine against key electronics manufacturers - AMD, Intel, Texas Instruments, and Advanced Micro Devices
The companies are accused of corporate inaction that allowed Russians to continue purchasing electronics and using them in the production of weapons.
The lawsuit materials mention five cases of Russian terrorist attacks on Ukraine using Shahed drones and Iskander and X-101 missiles, which resulted in casualties among the civilian population.