But Ukraine said casualties in the invading army were even worse.
The Briton who died was understood to be Scott Sibley, a former British soldier who had served in Iraq.
And therefore requires an appropriate, powerful response.
Here are some of the latest images to be sent to us from Kyiv, which show the aftermath of the Russian missile strike in the Shevchenkivskyi district.
But when we talk about war crimes, we cannot forget that the worst of crimes is war itself.
Russian mercenaries who allegedly posted the picture on social media complained: "This is what Putin and Shoigu brought us," referring to the defence minister.
John Kirby on training: "We're talking about roughly three locations outside of Ukraine and in this case we definitely can identify Germany as a site.
But also, we are in dire need of medication.