recorded 1917 or 1918

Here you can see the return of the Ukrainian war prisoners (also some musicians) from Wetzlar on march 3d 1918 - the recordings took probably place shortly afterwards on their way home on stopover in Berlin:
https://www.filmportal.de/node/1196306/video/1197760

It is possible, that recording took place earlier - here is the article about Lysenko musical-drama society, which shows, that activity of this society has been done between 1915 and 1917:

https://elibrary.kubg.edu.ua/id/eprint/33198/1/I_Sribnyak_M_Sribniak_V_Schneider_E%D0%86S_2020_17_IFF.pdf

Очень необычно, даже не подозревал, что были такие записи. Интересно, если украинцы записали тогда ещё что-нибудь.

Maybe they recorded earlier, but in any case later than 10-1917, as matrices 19063 - 19068 L are by comedian Otto Reutter - his repertoire comes partly from the revue "Geh’n Sie bloß nicht nach Berlin" which was premiered in that month. Even 19048 - 19048 L are from an operetta first shown 06-10-1917. Does the linked text mention any visit to Berlin where the recordings surely took place? (Neither can I read Ukrainian nor Russian)

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Очень необычно, даже не подозревал, что были такие записи. Интересно, если украинцы записали тогда ещё что-нибудь.

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Да, записали. У меня есть еще одна пластинка из той серии записей с номерами 19078 L , 19086 L. Обязательно выложу позже. Так что кроме двух, имеющихся у меня , и еще были записи.

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Does the linked text mention any visit to Berlin where the recordings surely took place? (Neither can I read Ukrainian nor Russian)

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Unfortunatelly, in the article there is not information about recordings. But from the text it turns out, that the Lysenko society was active between autumn 1915 and spring 1917. That is why I put the mentioned years in the field "date of recordings". Of course, it is possible, that this society continued to exist also in 1917 and 1918 y.