How to sort a dictionary inside another dictionary?

Python 3.5 +

Have a dictionary:

{ "Russia" : { "Moscow" : { "Population" : 5129 "Improvement" : 10 } "SPb" : { "Population" : 5486 "Landscaping" : 8 } Ussuriysk : { "Population" : 4685 "Landscaping" : 7 } "the village Separase" : { "Population" : 35 "Improvement" : 2 } } // and other countries }

Need to sort the elements within the population.
Many articles have been dug, but hard can't beat it