Telegraph investigation reveals those on front line are being exposed to gases banned during wartime

Russian troops are carrying out a systematic campaign of illegal chemical attacks against Ukrainian soldiers, according to a Telegraph investigation.

The Telegraph spoke to a number of Ukrainian soldiers deployed in positions across the front line who detailed how their positions have been coming under near daily attacks from small drones, mainly dropping tear gas but also other chemicals.

The use of such gas, which is known as CS and commonly used by riot police, is banned during wartime under the Chemical WeaponsConvention.

Ihor, the commander of a Ukrainian reconnaissance team who is deployed near the front line city of Chasiv Yar, in Donetsk Oblast, told The Telegraph: “Nearly every position in our area of the front was getting one or two gas grenades dropped on them a day.”