The Russians aren't the good guys, neither are the Neocons.
Convention (III) relative to the Treatment of Prisoners of War. Geneva, 12 August 1949.
Article 13 - Humane treatment of prisoners
Prisoners of war must at all times be humanely treated. Any unlawful act or omission by the Detaining Power causing death or seriously endangering the health of a prisoner of war in its custody is prohibited, and will be regarded as a serious breach of the present Convention.
In particular, no prisoner of war may be subjected to physical mutilation or to medical or scientific experiments of any kind which are not justified by the medical, dental or hospital treatment of the prisoner concerned and carried out in his interest.
Likewise, prisoners of war must at all times be protected, particularly against acts of violence or intimidation and against insults and public curiosity.
Measures of reprisal against prisoners of war are prohibited.
https://ihl-databases.icrc.org/en/ihl-treaties/gciii-1949/article-13?activeTab=undefined
Article 17 - Questioning of prisoners
Every prisoner of war, when questioned on the subject, is bound to give only his surname, first names and rank, date of birth, and army, regimental, personal or serial number, or failing this, equivalent information.
If he willfully infringes this rule, he may render himself liable to a restriction of the privileges accorded to his rank or status.
...
No physical or mental torture, nor any other form of coercion, may be inflicted on prisoners of war to secure from them information of any kind whatever. Prisoners of war who refuse to answer may not be threatened, insulted, or exposed to any unpleasant or disadvantageous treatment of any kind.
https://ihl-databases.icrc.org/en/ihl-treaties/gciii-1949/article-17?activeTab=undefined