The whole Holomodor is a huge mystery to me. I have no idea why we know so little about it. Moreover, according to my estimates, about half a million Jews died from this campaign, since about 10% of the Ukrainians were Jewish, and around 7M died in the Holomodor.
If I were a Ukrainian, I'd be extremely resentful of all things Russian, especially with the memory of '33 so fresh in my mind.
There were a number of Ukrainians who collaborated with the Axis during Operation Barbarossa. As soon as Operation Barbarossa began the Germans began to work on portraying themselves as liberators of the Ukraine and wanted to make it seems as though they were liberating them from communism.
A common tactic was to release POWs of a certain ethnicity in order to "sow the seeds of collaboration". The Germans in early stages of Barbarossa released over 200,000 Ukrainian POWs. Many Ukrainians served in local poilice battalions or as conscripts in army units set up by the Germans. These auxiliary police forces, known as "Ordung Hilfspolizei" were used by the Germans to keep order in captured areas and they were used to round up Jews and other undesirables.
Of course the most blatant form of collaboration was the SS division formed from Ukrainians (primarily a region of the Ukraine known as Galacia). The SS unit was known as the 14th Waffen Grenadier division of the SS (1st Ukrainian). The division was used in combat on the Eastern Front before being destroyed, it was eventually rebuilt and used in the Balkans until it surrendered in 1945. It is estimated that around 20,000 Ukrainians served in the SS as soldiers.
As for why more Ukrainians didn't help the Germans? Simply put the Germans were just as bad as the Soviets. The Germans stole food, imposed harsh restrictions on the local populace, they would conscript the young men to serve as laborers or in army battalions. For example, in one area the Germans imposed such harsh rationing on the local population that each man only got 0.5 kg of Bread to feed his family. Remember that the Nazis considered the Ukrainians inferior, and treated them as such. Also, many Ukrainians served in the Soviet military and thus many Ukrainians would have had family members fighting the Germans, thus making collaboration difficult.
Here are some pictures of the Ukrainians joining the Waffen SS
Sources:
Barbarossa: the Axis and the Allies by John Erickson
Hitler's Second Army by Edmund Blandford.
