Every year on November 28th Ukraine honors the victims of the Holodomor, a multi-cycle mass famine of the Stalin-era that killed millions. The Ukrainian government recognizes it as a genocide.
On November 28th, 2015 main mourning events and memorial services took place at the Memorial of Commemoration of Famine Victims in Kyiv.
The Ukrainian government thinks that Ukrainian famines of 1921-23, 1932-33 and 1946-47 were man-made and orchestrated by the USSR leadership at that time to suppress independence sentiments in the country. This is a consensus view which is supported by many other foreign governments, as well as a number of high-profile historians, but it is vigorously criticized by modern Russian leadership.
A famine of 1932-1934 killed 3.9 million of Ukrainians alone (13% of the population).