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Do you think this life expectancy statistic https://www.statista.com/statistics/1041395/life-expectancy-russia-all-time/ is also not right?

It could be that the death rate was unchanged because child mortality has been drastically reduced through better healthcare. https://www.statista.com/statistics/1041870/russia-all-time-child-mortality-rate/

And there are dips for ukraine but also child mortality fell a lot in Ukraine. https://commons.wikimedia.org/wiki/File:Life_expectancy_in_Ukraine.jpg

Edit: mistyped

But even with that disaster Mao still raised life expectancy more than the world average from 1955 to 1976(when he died).

Central planning mistakes produced too little food(cause they wanted to buy more machines to industrialize quicker) which were later corrected.

Edit: https://en.wikipedia.org/wiki/Great_Leap_Forward

https://data.worldbank.org/indicator/NE.GDI.TOTL.ZS?end=2021&locations=CN&most_recent_value_desc=true&start=1960&view=chart&year=2020