by diplomatic and prosecutorial assurances given by the requesting State (see Olaechea Cahuas v. Spain, no. 24668/03, §§ 43 and 44, 10 August 2006; Youb Saoudi v. Spain (dec.), no. 22871/06, 18 September 2006; Salem v. Portugal (dec.), no. 26844/04, 9 May 2006; and Nivette v. France (dec.), no. 44190/98, E