https://www.congress.gov/106/cdoc/tdoc16/CDOC-106tdoc16.pdf
Article11(3)further establishes both the express authority and
the obligation of the receiving State to maintain the person trans
ferred in custody unless otherwise agreed by both Central Authori
ties. The return of the person transferred is subject to terms and
conditions agreed to by the Central Authorities, and the sending
State is not required to initiate extradition proceedings for return
of the person transferred. '''The person transferred receives credit for
time served in the custody of the receiving State.'''
Does Ukraine have our people in jail?
Does Ukraine have E. Snowden?
Who might this be referring to?