Good morning everyone,
Just FYI, the Hyatt Regency Kiev does require Corporate ID upon check-in. My corporate rate is 220 EUR instead of 410 per night and they were quite insistent on getting the corporate ID. Good thing I had it with me.
By the way, it's the best hotel in town in my opinion. I also stayed at the Intercontinental and it wasn't as good (though still nice of course).