enter with US, exit with US. After that, when you go to the next destination, simply use the Russian. As someone else said, the only time destination countries require you to use the same passport as you left, it's when it's land crossings.
With that said, I do not believe there would be an issue if you use your Russian the whole trip. You're legal with either passport.
I did it with a cosmetic procedure for hair loss (PRP) - but - to be fair, i did it almost a year ago when they first came out with the DTV, so things were not as strict.
I could have done it via digital nomad but I thought the documents required were much easier for medical treatment.
I've had this happen to me when I applied for a regular multiple entry tourist visa. Luckily the fee was just $35. I forgot how could I have made this mistake but if I recall , there's two fields for the type of document, and I selected the wrong value in one of them.
In the sense that embassy officers can clearly see which document type it is, really sucks they can't just ignore that one field.
saw some news that BTS/MRT is closed until tomorrow until they can assess structural damage. So staff might have issues traveling for work. With that said, staying in, when shops decide to be open isnt going to help anyone. Traffic might be a b*tch tho.