Conservative MP Tobias Ellwood - a former captain in the British Army – has warned against going to Ukraine to help fight in the war against Russia.
He told BBC's 5Live: "I've spoken to many veterans; there is a desire, if you like, a draw, to want to go and do your part, to put your skills to use and support Ukraine in their hour of need.
"But I must stress, this is not a wise thing to do", the chair of the Commons Defence Select Committee added, saying: "You can end up putting yourselves and others in danger, particularly if you don't speak the language."
His warning comes amid reports of two British volunteers being captured by Russian forces.
On Monday, Paul Urey and Dylan Healey were apparently taken by troops at a checkpoint near Zaporizhzhia.
It is thought they were trying to evacuate a woman and her children.
Meanwhile, another British man captured by forces has been shown on television.
Andrew Hill was wearing military uniform and had bandages on.