Did fly incountry on Russian metal a while back. Moscow to Moldavia RT.
Some other folks had the same "loose seat" condition. I had a NON working seatbelt. All the FA would do was to tell me, in good english, "...just tie the belt together..."
And thats what I did! A Boy Scout square knot, so the slippery surface would not let loose!!
Warning, Russians love to smoke on planes! In fact, read somewhere in the NYTimes a month ago where Aeroflot was making threats against US DOT for refusing some added landing rights in US, because of US DOT requirement that no smoking on inbound US flights is US law.