The Holodomar coincided with pogroms and many of the Ukrainians deported and targeted were of Jewish ethnicity.
Being a jew and having some roots in Ukraine I can definitely tell ya that pogroms were not coincided with holodomor.
When one of my gran-dads was about 1 y.o, his family had to fled pogroms from Nikolaev to Odessa. And that was in 1914
Worst and bloodiest pogroms were carried in 1918-1921, in the independent Ukraine
All were carried out by local Ukrainian nationalists
There were also much earlier pogroms there, dating back to 18th and 19th century
The russians are now likely different in genes and for sure in language from Ukrainians.
You see, it's hard to define who is Russian and who is Ukrainian genetically, unless that person comes from a very remote village somewhere deep in the said territory
Ukraine now consists from territories that once were Poland, Romania and Hungary, and thus has a lot of genes from there. During soviet times, quite a lot of Russians went to Ukraine and quite a lot of Ukrainians left their homeland to live and spread elsewhere in the USSR, so genes became even more mixed
And the Russia itself is extremely big, has many very different nationalities that were mixed for centuries
An average Russian citizen maybe not so genetically diverse as an average American (we have noticeably less African heritage for example), but otherwise I think we are close