Since they were apparently sleeping during the "Russian Math" classes they forgot that shadows and sun angles would allow the building to be geolocated.
Now that workshop and its contents are destroyed, whether or not the Russian mechanics survived or not is unknown.
Nobody could ask for a better "enemy" than Russia. They have the economic might of Italy without the high quality design skills, and so far haven't been able to defeat a tiny, poor nation that is right next to them. Russia's military would be destroyed by US forces in days if they decided to fight the USA.
Also, in case you didn't know, the reason Russian Math is taught in the USA is that the best math teachers in Russia left since they were smart enough to realize that leaving Russia was their best option.
“Russians made a video of the tank with the turtle roof in the building where they did the modifications.”
That was the Ukrainian video, Einstein.