“ Everyone has the right to leave any country, including his own, and to return to his country.”
- Universal Declaration of Human Rights
https://www.ohchr.org/en/human-rights/universal-declaration/...
And "Everyone has the right to life, liberty and the security of person." Military service also serves the purpose to defend that right when the country is attacked. Rights aren't absolute, they have to be traded off against each other.
Ukraine has been violating that for young men since the start of its war.
Just because some people write some words doesn't mean they have any relevance to any society.
Yeah, those are just pretty words without the power to enforce them, like everything else the UN does
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It's a meaningless, feel-good rule. Every country has countless carve-outs. To give you a trivial example: in the US, you can't get a passport if you owe more than $2,500 in child support.