48. As regards the subsequent questioning sessions on 31 October, 4, 9 and 10 November 2004, it is notable that they took place after the applicant had been notified of his status as a suspect and had signed waivers of his right to legal assistance. However, in assessing whether these waivers were genuine and unequivocal, the Court notes that the applicant signed them while remaining in police custody. The first waiver of 31 October 2004 dates to the period, when, according to the applicant, he remained in off-the-record detention. There is nothing in the case file to rebut his submissions in this respect. The fact that the applicant signed this waiver while arbitrarily held in police custody and having no ability to consult a lawyer gives rise to a strong suspicion that it was obtained in defiance of the applicant’s will. This waiver cannot therefore be regarded as compliant with the Convention requirements.
49. The regularisation of the applicant’s detention from 1 until 10 November 2004 did not, in the Court’s view, substantially affect the legitimacy of the waivers signed by him on 4, 9 and 10 November 2004. In particular, at the material time the applicant was held under administrative arrest. The Court takes note of the applicant’s allegations that this arrest was effected with an ulterior motive, namely, to ensure his availability for questioning as a criminal suspect and to exert unlawful pressure on him. Similar allegations were examined in a number of other cases against Ukraine, where the Court condemned the practice of placing a person under administrative arrest to ensure his availability for questioning as a criminal suspect (see, for example, Nechiporuk and Yonkalo v. Ukraine, no. 42310/04, § 264, 21 April 2011; and Grigoryev v. Ukraine, no. 51671/07, § 87, 15 May 2012). In the case of Balitskiy v. Ukraine the Court also found that such a practice resulting in questioning the criminal suspects in defiance of applicable procedural guarantees constituted a structural problem in Ukraine (no. 12793/03, §§ 50-51 and 54, 3 November 2011). Regard being had to the above findings and the fact that the applicant was arrested under the pretext that he had committed an administrative offence almost immediately upon his release from the initial off-the-record custody, as well as his intense questioning as a criminal suspect throughout the period of his administrative detention, the Court finds his allegations credible. It considers that the present case discloses another example of the aforementioned structural problem. It therefore finds that the waivers of the right to legal assistance obtained from the applicant on 4, 9 and 10 November 2005 were signed by him in a state of particular vulnerability and in the absence of proper procedural guarantees. They can therefore not be regarded as compliant with the Convention requirements.
50. The Court notes, in addition, that, as appears from the case file, at the material time the applicant was not fully aware of the potential consequences of renouncing his right to legal assistance. In particular, it was not until later in the proceedings that the investigation advanced a charge of murder for profit, which could entail life imprisonment and so required mandatory legal representation under domestic law.