Pro-Russian fighters begin their assault on Donetsk airport last year. The 300-strong Chechen ‘Death battalion’ was involved in the bloody offensive during its five months in and around Donetsk. Photograph: Vadim Ghirda/AP Pro-Russian fighters begin their assault on Donetsk airport last year. The 300-strong Chechen ‘Death battalion’ was involved in the bloody offensive during its five months in an