... for years has supplied engines for the bulk of the Russian military-helicopter fleet.
You would think they wouldn’t be happy with this sale.
Not really. In 2014 Ukraine prohibited the export of dual-use technology to Russia and Motor Sich almost went out of business. Russia had its own production since the technology is actually theirs but preferred Ukrainian imports based on price. It wasn’t the option anymore and they ramped up domestic production.
In fact Motor Sich has no choice but to go Chinese. If Ukraine would listen to Bolton it ends up without airspace sector at all. Although it is already barely breathing.