 Complete the following phrase:  Following Umarovs retraction of his resignation, Gakayev, Vadalov and Tarkhan Gaziev, as well as the Arab commander Muhannad, renounced their oath of loyalty to Umarov, criticising his authoritarian leadership and his unilateral decision to abandon the cause of Chechen independence in favour of a Caucasian pan-Islamism Umarov later also said they criticised him for claiming responsibility for the 