I've met and worked with dozens, if not hundreds, of Russian-American software engineers in Bay Area / Silicon Valley, many of which are working for Fortune 500 companies. Their skills are like a u-curve, either so-so or extremely brilliant. On average, better than Indian/Chinese developers, especially if you're looking at ones who can think outside the box (in my experience/opinion/etc).
On the hardware side, Intel got
600 Russian engineers in early 1990s and 2000s. Probably one of the best Soviet microprocessor minds were there, so don't be surprised if their collective work with American-born engineers trickled down to modern Intel CPUs.