This is still a debatable point, with no clear agreed definition.
"The Holodomor genocide question consists of the attempts to determine whether the Holodomor, the catastrophic man-made famine of 1933 that claimed millions of lives in Ukraine, was an ethnic genocide or an unintended result of the "Soviet regime's re-direction of already drought-reduced grain supplies to attain economic and political goals." The event is recognized as a crime against humanity by the European Parliament, and a genocide in Ukraine, while the Russian Federation considers it part of the wider Soviet famine of 1932–33 and corresponding famine relief effort The debate among historians is ongoing and there is no international consensus among scholars or governments on whether the Soviet policies that caused the famine fall under the legal definition of genocide."[1]
However you view it, it was an horrific event where millions died of hunger.
[1] https://en.wikipedia.org/wiki/Holodomor_genocide_question
The scholarly debate on this issue is to say the least, very complex. You can't just say "it wasn't directed against Ukrainians as a people, period."
Khruschev was Ukrainian,
Khrushchev was born to poor parents of Russian descent. Anyway, while hardly a saint, he doesn't appear to had much, if any, role in the Holomodor. Chernenko is generally regarded to be of mixed background. As to Brezhnev,
Brezhnev was born on 19 December 1906 in Kamianske in Ukraine), to metalworker Ilya Yakovlevich Brezhnev and his wife, Natalia Denisovna Mazalova. His parents used to live in Brezhnevo (Kursky District, Kursk Oblast, Russia) before moving to Kamenskoe. Brezhnev's ethnicity was specified as Ukrainian in some documents, including his passport, and Russian in others. --WP
The most "Ukrainian" of any of these may have been Gorbachev. But we all know where he sits in the pantheon of "supreme leaders" of the USSR.
Nothing close to the treatment of Native Americans, Asians and Blacks in the post-war United States.
Just because the Holomodor wasn't directly comparable to the Nazi genocides doesn't mean that (1) the Ukrainian people didn't suffer disproportionately during the 1932-1933 famine, and (2) the Soviet leadership (or the subset responsible for the Holomodor) wasn't aware of this fact, as it was happening.
"If you are from a Baltic country <..> people celebrate Nazis as heroes, just because they against Russia."
No. Simply no.