Russia: Eh, no. That's just a temporary blip caused by a lot of the people born before 1945 not having made it that far, so the population was unnaturally skewed young. Few elderly to be dying off at the time because a large portion of those people died off 50-60 years prior.

They're set for sharp decline going forward, and changes in geopolitics look likely to dry up or outright reverse their modest immigrant flows from former USSR countries.

Japan: Is shrinking ever more rapidly, not less.