My employer is based in Warsaw, Poland with offices in Ukraine, Russia, and many other countries. A day or two after the invasion they sent a company wide email saying they will pay for and coordinate moving, transit, housing, food, etc for anyone and their family in Russia, Ukraine, or the surrounding countries. About a week later they shut down operations in Russia. Though not confirmed we were told a not insignificant portion of Russian employees fled to Poland and still work my employer.

I doubt this occurred at very many places, but anecdotally Poland gained a meaningful number of highly skilled tech workers. I haven't worked with any of the Russians, but many of my Polish counterparts hold the belief that the US is largely responsible for the invasion of Ukraine. I will be very interested to see immigration numbers of where Russians end up.