Dear Anna.
First at all Odessa was established in 1794 by the decree of Empress
Catherine the Great of Russia,on land conquered from the Ottoman Empire,
on the site of the Black Sea fortress town of Khadzhibei.
Odessa was part of the Russian Empire until the Russian Revolution in 1917.
In 1922 Odessa became part of the Ukrainian Soviet Socialist Republic.
And the Ukrainian Soviet Socialist Republics was part of the Soviet Union.
After the collapse of the Soviet Union in 1991,Ukraine became independent.
And if you talking about genocide,do you know what happend in Odessa
On May 2.2014?
If not, I will tell you.On this day 48 people been burn to death and over 200
Injured,just because they want to make Russian one of the official language.
Please,please do not rewrite history.