There is a little or no information of Zarubin. He was a secretary (minister) of the Ukrainian government, however he held a position that was assigned to the Russian minority representative. That was by the request of the Russian Provisional Government that demanded to have several members of Russian political background. Later after the dismissal of the first government and its reorganization in the next government Zarubin held two positions. Since July and until the end of fall he served as the state controller, beside his secretarial assignment as the secretary of Post and Telegraph services. Zarubin also was elected to the delegation together with Volodymyr Vynnychenko and Ivan Steshenko that was scheduled to meet with the government of Alexander Kerensky on October 21, which was accusing the Vynnychenko's government in separatism. Later that meeting was canceled due to the Bolshevik coup-d'etat. Zarubin's further fate is unknown.