NYT:
[His] own succession plan could be resting on his 17-year-old son, who got married and received congratulations from Mr. Putin over the weekend. But that would require circumventing Russian law requiring regional leaders to be at least 30 years old.
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The teenager was also awarded two medals in the span of 10 days
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And there are other contenders, including a man who led an effort to round up and brutalize gay people and another who went off to fight for Russia in Ukraine.