to a lack of relevant documents, it is for the Government to argue conclusively why the documents in question cannot serve to corroborate the allegations made by the applicants, or to provide a satisfactory and convincing explanation of how the events in question occurred. The burden of proof is thus shifted to the Government and if they fail in their arguments, issues will arise under Article 2 and/or Article 3 (see {Togcu} v. Turkey, No. 27601/95, § 95, 31 May 2005, and Akkum and Others v. Turkey, No. 21894/93, § 211, ECHR 2005-II).
87. Taking into account the above elements, the Court is satisfied that the applicant has made a prima facie case that her son was abducted by State servicemen. The Government's statement that the investigators had not found any evidence to support the involvement of State representatives in the kidnapping is insufficient to discharge them from the above-mentioned burden of proof. Having examined the documents submitted by the applicant, and drawing inferences from the Government's failure to submit the documents which were in their exclusive possession or to provide another plausible explanation for the events in question, the Court finds that Khizir Tepsurkayev was taken away on 27 August 2001 by State servicemen during an unacknowledged security operation.
88. There has been no reliable news of Khizir Tepsurkayev since the date of the kidnapping. His name has not been found in any official detention facility records. Finally, the Government have not submitted any explanation as to what happened to him after his arrest.
89. Having regard to the previous cases concerning disappearances in Chechnya which have come before it (see, among others, Bazorkina, cited above; Imakayeva, cited above; Luluyev and Others v. Russia, No. 69480/01, ECHR 2006-... (extracts); Baysayeva v. Russia, No. 74237/01, 5 April 2007; Akhmadova and Sadulayeva, cited above; and Alikhadzhiyeva v. Russia, No. 68007/01, 5 July 2007), the Court finds that in the context of the conflict in the Republic, when a person is detained by unidentified servicemen without any subsequent acknowledgment of the detention, this can be regarded as life-threatening. The absence of Khizir Tepsurkayev or of any news of him for several years supports this assumption.
90. Accordingly, the Court finds that the evidence available permits it to establish that Khizir Tepsurkayev must be presumed dead following his unacknowledged detention by State servicemen.
III. Alleged violation of Article 2 of the Convention
91. The applicant complained under Article 2 of the Convention that her son had been deprived of his life by Russian servicemen and that the domestic authorities had failed to carry out an effective investigation of the matter. Article 2 reads:
"1. Everyone's right to life shall be protected by law. No one shall be deprived of his life intentionally save in the execution of a sentence of a court following his conviction of a crime for which this penalty is provided by law.
2. Deprivation of life shall not be regarded as inflicted in contravention of this article when it results from the use of force which is no more than absolutely necessary:
(a) in defence of any person from unlawful violence;
(b) in order to effect a lawful arrest or to prevent the escape of a person lawfully detained;
(c) in action lawfully taken for the purpose of quelling a riot or insurrection."
A. The parties' submissions
92. The Government contended that the domestic investigation had obtained no evidence to the effect that Khizir Tepsurkayev was dead or that any servicemen of the federal law enforcement agencies had been involved in his kidnapping or alleged killing. The Government claimed that the investigation into the kidnapping of the applicant's son met the Convention
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