British military personnel have begun training members of the Ukrainian army fighting pro-Russian rebels.
The 35 trainers are working in the southern city of Mykolaiv and will spend about two months in the country, according to the (BBC).
They will be training forces engaged in battles in eastern Ukraine in medicine and defensive tactics, and supplying non-lethal equipment.
The deal was announced by the British Prime Minister David Cameron last month.
It is the first time a Western nation has conducted a long-term military training programme in Ukraine since its war against pro-Russian rebels began last year.
A ceasefire took effect on 15 February following an agreement reached in Minsk, Belarus, and has largely held despite sporadic shelling.