Is the following graph of male life expectancy of ex-Soviet states spanning Chernobyl accurate?

The source of the graph is a blog post (チェルノブイリ事故後の平均寿命), which according to google translate means "Life expectancy after the Chernobyl accident".

According to someone who showed this to me, the title of the graph is "Former Soviet Union Nations". Acquamarine is Ukraine, red is Russia, green is Belarus, yellow is Uzbekistan, and purple is Kazakhstan.

By accurate, at a minimum I mean "the data has not been fabricated by anti-nuclear activists". Ideally, this'd also mean "the data has not been manipulated by the government, and is reasonably accurate", but maybe that's too much to ask.

I was skeptical of this graph because the best alternative explanation I had for the fall in life expectancy was the collapse of the Soviet Union, and going from a dictatorship to a democracy being associated with a lowering of life expectancy was somewhat counter-intuitive to me.

Related question: Have several hundreds of thousands of people died because of the Chernobyl disaster? - the loss of life described in the accepted answer would probably not cause the dramatic decline in Russian life expectancy shown in this graph.