Here is some of what Apple actually says about missing content:
Legal - Apple Media Services - Apple
- J. “Certain Services and Content available to you in your Home Country may not be available to you when traveling outside of your Home Country."
- F. ” Purchased Content will generally remain available for you to download, redownload, or otherwise access from Apple. Though it is unlikely, subsequent to your purchase, Content may be removed from the Services and become unavailable for further download or access from Apple (for instance, because Apple loses its right from the Content provider to make it available). To ensure your ability to continue enjoying Content, we encourage you to download all purchased Content to a device in your possession and to back it up."
- H. ”You can see Content types available for Redownload in your Home Country at Availability of Apple Media Services - Apple Support . Content may not be available for Redownload if that Content is no longer offered on our Services.
Content also may be removed from our Services at any time (for instance, because Apple loses its right from the Content provider to make it available), after which it cannot be downloaded, redownloaded, or otherwise accessed from Apple. We encourage you to back up your Content regularly."
I don't know how long you were away in Australia but it is possible that the content was removed from the Ukrainian store while you were absent.
