According to The New York Times, Ukrainian troops were able to intercept a call from a Russian general and kill him.
Two US military officials were cited in the paper. The general was not named or given a location.
The report supports the idea that the Russian military is using communications that are not secure.
It has killed four generals so far, an unusual toll for such senior officers.
The general's death was said to be the result of an intercept call.
The paper reported that the Ukrainians attacked and killed a general and his staff after intercepting his call.
A person close to Ukrainian President Volodymyr Zelenskyy told The Wall Street Journal that Ukrainian intelligence had set up a special unit to hunt senior Russian commanders.
Significant problems with communication were mentioned in the announcement of Major General Gerasimov's death.
In order to demonstrate that point, Ukraine released audio purporting to show a Russian soldier reporting the death of Gerasimov to a superior.
In the call, the soldier said that Russia's Era communications system had stopped working in Ukraine, forcing them to use unsecured lines.