Canada

The famine was caused by multiple factors and blaming it as if it were Stalin's genocidal policy is frankly revising history.

Due to collectivization (giving up owned land to join the collective farm), landlords were very unhappy. Many resorted to slaughtering their own livestock in protest and many wealthy landowners indicated that they were "disincentivized" from working to produce grain in similar quantities as in the past. In the beginning, many Ukrainian nationalists took to murdering workers at collective farms to hinder their productivity. Moreover, the import/export relationship to the rest of the Soviet Union was weak as Ukraine predominantly produced foodstuffs (that were produced in increasingly high quantities in the Eastern territories because of collectivization) and not machinery (which had to be imported) - Ukraine's exports lost value while their imports gained value.

I would recommend reading the works of Isaac Mazepa (a Ukrainian nationalist), Louis Fischer (an American journalist), and statements from both Stalin and the Politburo at the time. Stalin and the Politburo at large were aware that Kosior and Chubar were misrepresenting numbers, but not to what degree - thus, the aid they sent was grossly insufficient. Stalin butted heads with both Kosior and Chubar and was extremely critical of both of them. Both Kosior and Chubar were executed in the great purge under orders from Stalin.

Famine struck Ukraine at an incredibly inopportune time in Ukrainian politics and led to the regrettable death of millions. Famine also struck in conjunction with typhoid fever and the rise of the OUN (emboldened by Hitler's success in Germany). You can read more about the OUN through Dmytro Dontsov's writings.