"Ukrainian SS personnel and their German officers in Plaszow. These men were used as guards to supplement the German SS staff until the official redesignation of Plaszow as a concentration camp in January 1944. Thereafter, the camp was staffed by 600 men of the SS Totenkopfverbaende (Death's Head Units). (1943 - 1944)"
http://history1900s.about.com/library/holocaust/blplaszow4.htm
Ukrainians were used as guards at concentration camps by the Nazis throughout Eastern Europe. They were vicious and cruel. I read a book about Treblinka. Violently, gang-raping a young girl before she was to be put to the death was nothing to them. Forcing a prisoner to have sex with a dead woman was nothing to them.
Although...
"Jan. 27, 1945 - First Soviet soldiers (the 60th Army of the First Ukrainian Front) enter Auschwitz and liberate the 7,000 remaining prisoners. At least one million Jews were murdered at Auschwitz, along with 75,000 Poles, 20,000 Roma, 10,000 Russian POWs and tens of thousands of homosexuals and others. But these are only estimates. No firm counts were taken of the countless numbers who were sent straight to the gas chambers on arrival."
http://www.cbc.ca/news/background/auschwitz/
But I attribute the First Ukrainian Front's liberation of the remaining prisoners of Auschwitz not to their love of Jews but to their love of independence. There is a long history of antisemitism and outright persecution of the Jews among the Ukrainians dating all the way back to the times of Ivan The Terrible.