o 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
122. The Government contended that the domestic investigation had obtained no evidence to the effect that Artur Akhmatkhanov 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 applicants' relative met the Convention requirement of effectiveness, as all measures available under national law were being taken to identify those responsible.
123. The applicants argued that Artur Akhmatkhanov had been detained by State servicemen and should be presumed dead in the absence of any reliable news of him for several years. The applicants also argued that the investigation had not met the effectiveness and adequacy requirements laid down by the Court's case-law. They pointed out that the investigators from the district prosecutor's office had destroyed the evidence, namely the cartridge cases and blood samples collected from the crime scene. The investigation into Artur Akhmatkhanov's kidnapping had been suspended and resumed at least nine times - thus delaying the taking of the most basic steps - and the relatives had not been properly informed of the most important investigative measures. The fact that the investigation had been pending for such a long period of time without producing any known results was further proof of its ineffectiveness. They also invited the Court to draw conclusions from the Government's unjustified failure to submit the documents from the case file to them or to the Court.
B. The Court's assessment
1. Admissibility
124. The Court considers, in the light of the parties' submissions, that the complaint raises serious issues of fact and law under the Convention, the determination of which requires an examination of the merits. Further, the Court has already found that the Government's objection concerning the alleged non-exhaustion of domestic remedies should be joined to the merits of the complaint (see paragraph 106 above). The complaint under Article 2 of the Convention must therefore be declared admissible.
2. Merits
(a) The alleged violation of the right to life of Artur Akhmatkhanov
125. The Court has already found that the applicants' relative must be presumed dead following unacknowledged detention by State servicemen. In the absence of any justification put forward by the Government, the Court finds that his death can be attributed to the State and that there has been a violation of Article 2 in respect of Artur Akhmatkhanov.
(b) The alleged inadequacy of the investigation of the kidnapping
126. The Court has on many occasions stated that the obligation to protect the right to life under Article 2 of the Convention also requires by implication that there should be some form of effective official investigation when individuals have been killed as a result of the use of force. It has developed a number of guiding principles to be followed for an investigation to comply with the Convention's requirements (for a summary of these principles see Bazorkina, cited above, §§ 117 - 119).
127. In the present case, the kidnapping of Artur Akhmatkhanov was investigated. The Court must assess whether that investigation met the requirements of Article 2 of the Convention.
128. The Court notes at the outset that not all of the documents from the investigation file were disclosed by the Government. It
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