"However, this process relies on the individual in being forthcoming with accurate information."
Kiwi soldier Dominic Abelen was killed in Ukraine. Photo / Supplied
The Ministry of Foreign Affairs and Trade would not say whether Russians had Abelen's body, or what efforts were being made to repatriate him.
It said it did not comment on consular cases for privacy reasons.
Multiple sources have told RNZ they believe his body may be in Russian hands.
In a statement provided to Newshub, the Russian embassy said: "We do not bear any responsibility for the lives of citizens who decided to take part in [what Russia claims are] illegal military activities against its forces in Ukraine.
"Please, don't call Moscow later to help you find out what happened to your citizens."
A further response provided to the news outlet stated: "Any armed activity against Russian military personnel will be cut short immediately, and the armed groups of foreign mercenaries and 'volunteers' will be eliminated."
The Herald sought comment from the Russian embassy this evening but was advised the embassy was closed and to call back Monday.