<prompt> Bhala okuqhubekayo kwalesi sigaba - UKovalyev ube ngumgxeki okhuluma ngokungagunci ngokuthambekela kobushiqela ekuphathweni kukaBoris Yeltsin noVladimir Putin. Ngo-1996, wasula njengenhloko yekhomishini kaMongameli yamalungelo abantu ka-Yeltsin, ngemuva kokushicilela incwadi evulekile eya ku-Yeltsin, lapho uKovalyev asola khona umongameli ngokuyeka izimiso zentando yeningi. Ngo-2002, wahlela ikhomishana yomphakathi ukuba iphenye ngamabhomu ezindlu zaseMoscow ngo-1999  <response>: iKovalyov Commission, eyalinyazwa ngokoqobo ngemva kokuba elinye lamalungu ayo, uSergei Yushenkov, libulewe, elinye ilungu, u-Yuri Shchekochikhin, okusolakala ukuthi labulawa ushevu nge-thallium, nomeluleki walo wezomthetho nomphenyi, uMikhail Trepashkin, baboshwa. 