A 19-year-old soldier with the elite Coldstream Guard has been arrested by British military police after he returned from Ukraine, The Sun reported Sunday, citing military sources.

The soldier went absent without official leave (AWOL) some two weeks ago to join Ukraine’s International Legion of Territorial Defense, which brings together foreign fighters wishing to engage Russian troops.

According to the tabloid, the soldier had been “bored” with the ceremonial role of his regiment.

He wanted to see some real action as his promised tour to Afghanistan didn’t happened due to the hasty withdrawal of the Western coalition forces from that country last year.