This seems like a really bad idea.
First, you can't just ignore the voltage difference problem. The battery charger might have a chance of working natively or with an adapter (read its labeling) - but that's a hokey way to hook it up. The Dremel is probably beyond the ability of cheap Chinese power adapters, not least because it's a motor and I seriously doubt that overpriced $23 thing with 50 cents of electronics inside it actually does VFD.
It's generally a fool's errand to try to convert tools from one voltage/frequency to another. If you want that, then get Euro or UK tools that are 230V/50 Hz.
Further, there's the matter of plugs. USA stuff will not plug into Russian outlets, nor should it. Russia uses the Europlug (ungrounded) or Schuko (grounded). This is the same as almost all of mainland Europe. So order your father-in-law European appliances if you must.
Lastly, tools are personal. You select the tool you like, and then you adapt to it and love it. It's a thing you've got to do.
Parents don't just use stuff you give them because you gave them. You know perfectly well this is the best you can hope for. 90% of the time it goes on the shelf or in the trash. Given that you'll be giving tools of incompatible voltage, and incompatible plugs, this is 100% guaranteed in this case. If you want to do a gesture like this, either recognize it for the foolhardy, empty gesture it is and hope your FiL will feel the love... or get serious and obtain Euro appliances. Or better yet, sort out the barriers to giving a gift card at your FIL's favorite tool shop.