Originally Posted by
corporate-wage-slave
Ditto. I've got a heap of middle names (for which I can only blame my hippy 1960s parents, it was probably a good idea at the time, but they certainly don't remember it!). If Russia doesn't need them, if Belarus doesn't need them, heck if Ryanair doesn't need them, then it's OK to drop the middle name.
The TSA and DHS internal guidance also allow for travel without middle names.
The US is the only place I recall it being an issue, and there was no issue with me actually flying, it is just I had to go to the service desk with my documents and they had to do something manually. It is possible it related to the ESTA more than the ticket/passport?