The Ukrainian soldiers at the front are fighting in very difficult conditions, according to Sten, whose real name is something else. Access to food and clothing is low, he says.
"I've seen soldiers in winter environments walking around in the mud with replicas of Nike sneakers. It's a suffering that I don't think we see here at home," he says.
"Russia strikes at volunteers"
Stone joined Hospitallers Ukraine in March 2022. It is a medical battalion consisting of around 500 volunteers.
He remained in Ukraine until December last year when he travelled home for a funeral of a Swedish colleague, who died during a medical operation. Now he has travelled back to Ukraine.
The goal is to stay there until the war is won or goes down to a calmer level, he says.
The reason he wants to remain anonymous is partly because he doesn't want to be famous. But there is also another, far more serious reason:
"Unfortunately, Russia is targeting volunteers. We create a lot of support for Ukraine when we talk about our experiences in the media, and increase the pressure on Western governments to send more support to Ukraine.
False death notice
He talks about how the Russian media published a fake news about one of his American colleagues after she appeared in the media with her name and picture.
"They reported that she had died on the front. This fake news reached her family before she could reach them themselves. I would very much like to spare my family from that kind of harassment.
What drives Swedes to risk their lives in Ukraine? See more about the foreign volunteer soldiers in Utrikesbyrån: The Swedes at the Front on SVT Play.