Moscow has denied there is anything "strange" with Russia's official coronavirus death figures.
"No," was all President Vladimir Putin's spokesman Dmitry Peskov had to say when asked by reporters.
Peskov earlier said the low mortality rate was due to a highly efficient Russian healthcare system rather than statistical manipulation as some experts in Russia and abroad have suggested.
Russia has so far reported more than 500,000 cases, the world's third-largest number, and 6,532 deaths - a tally that is significantly lower than in many other countries with serious outbreaks.
The World Health Organization said this week that Russia's low death rate was "difficult to understand".
Last month, Moscow's authorities more than doubled the official death toll from Covid-19 in the Russian capital for April.
They said the new tally included even the most "controversial, debatable" cases.
A nurse adjusts her goggles in an intensive care unit in Moscow's hospital