Firstly, I can say that this picture was created by someone with pro-Russian views, someone who is interested in the final collapse of Ukraine, so some of the information presented here may be distorted in favor of Russia. This in no way means that I deny this information. If this is completely objective information, why in the image only Ukraine is losing territory and no one else? Siberia and Tatarstan could well be separate states. Kaliningrad region could also pass into the another country.
Secondly, all territorial claims are useless for the EU countries. I mean (on the example of Hungary) an EU country cannot add new territories under EU law, this is prohibited. It is necessary either to withdraw from the EU (which Hungary periodically wants to do, but does not actually do) or to do absolutely unrealistic things in EU laws. Hungary distributes its passports to Ukrainian citizens in Transcarpathia, Romania distributes mainly in Bukovina and the Republic of Moldova, Russia distributes in Crimea and in Eastern Ukraine. Actually, it is beneficial for people in Ukraine to have two citizenships: with a citizen of Hungary or Romania they can freely travel and work in the EU.
About the picture itself: Poland, of course, would like to have Lviv and some part of Western Ukraine, but I doubt that this is possible. They also want Lithuania and Vilnius. Belarus has a connection with Northern Ukraine, Chernigov. But this is not enough to get these territories. And all the more so since the whole of Belarus is essentially a vassal of the Russian Federation, Belarus is not an independent object in politics. Republic of Moldova is likely to receive nothing. Just because Romania will regain the Republic of Moldova, and after that Romania will add south parts of Ukraine. Also in the Republic of Moldova there is a problem with Transnistria. As for Russia, I think if they wanted to take all the territory of Ukraine, they would have done it earlier and much faster. Turkey has at least a historical right to Crimea. But Crimea will most likely never become Turkish. At least until the collapse of Russia. Slovakia is likely to receive nothing. Or several local areas and villages.