`` He was enthusiastic , he was engaging , I think he was always true to his beliefs , he did n't take himself over-seriously , but he did his best to promote liberal reform then , and he had been before a very successful mayor of one of the central towns , Nizhniy Novgorod . '' Boris Nemtsov was a former deputy prime minister who became an opposition leader . He was a fierce critic of President Vladimir Putin , especially his policy on Ukraine .
Boris Nemtsov was a former deputy prime minister who became an opposition leader . He was a fierce critic of President Vladimir Putin , especially his policy on Ukraine .