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The incident occurred in Thursday in the Solomenskiy district of the capital Kiev. The victim had suffered numerous knife wounds.
Police said the motive for the fatal attack was unknown. The man had approached the UN High Commissioner for Refugees (UNHCR) in Kiev two years ago for legal assistance.
UNHCR, along with some 30 other groups belonging to the Diversity Initiative human rights coalition in the country, have urged Ukrainian authorities to conduct a thorough investigation into the incident.
Increasing violent attacks on foreigners and non-Ukrainians have been reported in Kiev and elsewhere in the country over the past two years.
UNHCR says it has repeatedly expressed concern over uNPRovoked attacks, beatings and verbal abuse aimed at asylum-seekers, refugees, migrants, foreigners and minorities in Ukraine.
According to evidence collected from victims by Diversity Initiative, media sources and non-governmental organizations, there have been at least 40 such attacks so far this year, including four murders.