Mywife and I are going to Russia for three days at the end of July. We are landing in Moscow around 2am on a Saturday morning and leaving on Monday eve.
As we both have Argentinean passports, we do not need a visa to enter Russia, which is a great plus.
However it is my understanding that we need to register us there, most likely at the hotel.
Do you know if this is mandatory considering the fact that most of our time is during weekend? in this case we would only be able to do it on Monday morning.