Ukrainian Foreign Services (Embassies & Consulates) worldwide have stopped issuing passport renewals for their male citizens living abroad:
Ukraine Stops Issuing Passports To Men Of Fighting Age Living Abroad (YouTube link for DW News story).
It's reported that Embassies & Consulates will only issue paperwork related to the facilitation of travel back to Ukraine.
Luckily, my Ukrainian piano accompanist in HCMC is a woman...