Demographically, they're already past the point of no return. I could use a more illustrative word, but I'd be banned.
Even if they changed all their policies today, threw down their guns in Ukraine today, and concentrated on giving 20 - 30 year-olds a reason to be "in the mood" tonight and every night for the foreseeable future, there are no longer enough young people to recover.
The chart below is from Peter Zeihan, who also cautions that these are Russian numbers, and the Russians
always lie about their numbers.
Also, note that the numbers are from 2020. A significant portion of the last decent cohort they had (the early 1990s) has already aged from the 30 - 34 bracket into 35 - 39. That is really long in the tooth to be a new birth parent in a place as nasty as Russia.
IOW, it's probably materially worse than shown here.