About releaseable Ukraine, there are something weird as for my, I mean why bucovina and bessarabia is not cores?(at least it didt showed) You added Poland part to the Ukraine so considered Soviet pre-war additions so why dont make it complete and add bucovina and bessarabia? Previously bucovina was part of Austro-Hungary and it have a lot of ethnic Ukrainians in it. Bessarabia was part of Russian empire and consist mainly from Ukrainians. Please consider it.
And second thing i dont understand is the first flag with yellow abowe blue. Why use it? It's just one of the variants of democracy flags. Maybe it would be better to take 3rd flag for neutrality, and for a fascism use real one. Ukrainian fascists and nationalists using dark red above black even now, and they used it in the WWII period.
There were Ukrainians and Russians in Bessarabia, but mostly on the eastern edge (regions which later were added to the Ukrainian SSR). For the rest Moldovans were majority.
It probably would require some small regions to add these cores with meaning, otherwise it would weird if Moldovan-majority areas would be Ukrainian cores.
Why does the Ukraine have no ownership over the Crimea? After they got released from the Sowjetunion 1991/92 in RL, they got it (till the russians took it back 2014).
Probably this needs some clarification. Regardless of the current events:
For a long time Crimea belonged to Crimean Khanate, who took it from the previous owners. During this time, these lands were not Slavic.
Later with the expansion of the Russian Empire to the south, the steppes were settled, but the peninsula itself was still part of the Crimean Khanate.
By the end of 18th century it was annexed.
But by the end of 19th century and first half of XX it still was heavily Tatar. From 1897:
Yelllow - Ukrainian, Red - Russian, Green - Tatar.
So basically neither Ukrainians nor Russians settled there in big numbers outside of cities.
Later, after the revolution and until the war, it existed as an Autonomous Soviet Socialist Republic as a part of the Russian Soviet Federative Socialist Republic. These small Autonomous SSRs were quite common and consisted of some specific ethnicity, different from the main ethnicity of the SSRs they were parts of.
After the war the population of the peninsula dropped significantly, and Tatars with some others were deported in masses due to the Nazi collaborationism accusations.
Since this moment the demographic composition shifted harder and Russians became a solid majority there, with Ukrainians second. The Tatars were almost none by this point, and the Autonomous SSR was turned into an Oblast (i.e. a "standard" division for regions without significant local ethnicities).
Later it was transferred from the Russian SFSR to the Ukrainian SSR for administrative purposes, and in terms of infrastructure it was more connected to the Ukrainian SSR than to the Russian.
After the Soviet dissolution, there were some issues with it both with the population and on the level of governments (mostly question of Sevastopol and Simferopol ownership, since their status was quite vague).
Some Tatars returned, but they are still a minority (~10%).
In the end it became an Autonomous Republic as a part of Ukraine.
Because Crimea was never part of Ukraine and it was gifted by Khrushchev in 54.
Not as much "gifted" as "assigned". There is nothing sacral there, just usual administrative doings.