II. Specific provisions
E. Enforcement of sentences of imprisonment in Liechtenstein
Article 34
General provisions
(2) The sentences of imprisonment passed by the International Criminal Court or International Tribunal shall be enforced directly. Sentences passed by the Court or a Tribunal may not be modified. In the light of instructions from the Court or Tribunal, enforcement shall be subject to the relevant provisions of Liechtenstein law on the understanding that the conditions of detention correspond to those of persons convicted of similar crimes in Liechtenstein.
Non-modification of sentence by State
Conditions of imprisonment / detention - international treaty standards
EDIT.