GENERAL PART
Section I. Principal provisions of the criminal executive legislation of the Republic of Tajikistan
Chapter 1. General provisions
Article 5. Territorial application of the criminal executive legislation and its effect in time
1. Execution of a sentence as well as application of other penal measures and assistance to the persons subject to release shall be fulfilled in accordance with the legislation valid at the time of their execution.
Non-retroactivity
Nulla poena sine lege
EDIT.