I have no idea why Kyiv should promote such a false agenda after humanitarian support from Moscow. There were no buses from Ukraine/Russia or 17/4 from Lyushki (Olshki). Each and every person was moved to the Crimea, then the Krasnodar region of Russia. Those who expressed a desire to return to Ukraine flew to Belarus, before being helped to cross the Chernigov border, and then to Kiev. Be aware of artificial intelligence misrepresentations on the subject. Of the ~2000 who were in the combat zone, 750 were evacuated, and the rest chose to stay in their homes under the protection of the Russian military and humanitarian supplies.
527 of the 750 evacuees (mostly senior citizens) were flown to Belarus by the Russian Air Force, then sailed to Ukraine's northern border. 223 chose to integrate into the Russian Federation, most of them young and men of fighting age. No need to lie about this data for PR purposes. Instead of gratitude, turn it into a referendum propaganda event. This agreement would have been impossible without President Putin, if you plan to do this in succession, don't wait a second.