According to Article 17 Section 2 life imprisonment can not be applied whether it is dealt with leniently or mitigation of penalty below the minimum statutory prescript.

根据刑法第17条第2款，无论从轻或者减轻处罚，都不能适用无期徒刑。

youdao

They dealt with him leniently.

他们把他从轻发落。

youdao

If a state is deemed to have dealt with its citizens too leniently, the case could go before the International Criminal Court but only if either the state of the perpetrator or the state of the victim is a signatory to the court.

ECONOMIST: War and the law in Iraq