I disagree. Some have argued on technical grounds that Greece did not exist because it was a collection of states, but I don’t think this technicality is sufficient to answer the question; Italy was ruled by the Romans, but we do not consider the modern nation of Italy to be a successor to Rome.*Greece's statehood has a history since ancient times. Ukraine as a country didn't exist prior to the 20-th century.
Similarly, the revolt in Greece that resulted in its independence was not viewed at the time as being in continuity with the Greek states of antiquity.
Ukraine did not “exist” in being independent, but it may have existed as much as Greece, Italy, or Germany did as a concept, though the ability of the Ukrainians at that time to assert independence was not there. To me, this sounds like saying there is no historical rationale for Poland because of it being finally partitioned between Prussia and Russia.
The last native Prince of Wales died in 1282. Is there too no Wales?
*Mussolini? he stunk out loud