It was a pretty cheap ticket to go from Warzwa to Riga (We actually didn’t go strait to Moskva, because I refused to spend more than 3 hours waiting in FRONT of the Belarussian ambassador). Starting at 10 pm and arriving 13h later. The bus was quite modern standard including modern seat setup, meaning that my legs got thumb after approximately 30 min. The promised WiFi was not working and the free tea costed 1,20€. However, we arrived in Riga on time after a long journey along country roads. I kind of missed the fact, that there exist no highways in Lithuania and Latvia.
The tour from Riga to Moskva was a lot less social due to at least 10 cm more space for legs and feeds (the version was likely 15 years older), but the bus driver found the ventilation first 30 km before Moskva. This turned the bus literally into a big Russian sauna. So during the 30 min waiting time at the Latvian-Russian boarder not only the nerves caused some sweeting of our travel companions.
The final conclusion from our side, no more overnight bus trips, if not absolutely necessary.
Unfortunately, Tom had a good point not making any pictures on the Russian boarder, so this will only be a short little boring note.