Does Ukraine no longer have mercenaries?
They are trying to expand it now, but - listen - mercenaries are also not fools.
Russia offers a signing bonus of $20-50K - on the spot - depending on region. For many people in Cuba, in Angola, in Ethiopia, in Nepal, and other places - this is much more than they could ever hope to earn in a military career (we only recruit persons that can prove prior service).
Ukraine offers something on the level of $30-40K in annual compensation, but practically no signing bonuses, and no idea on when you will be released.
In the first three years of the war, Ukraine had a stable supply of people that simply hated Russia. Disaffected Georgians, Lithuanians, Belarusians, and so on. A lot of Poles also.
These last two years - most of Ukraine's foreigners are Colombians. There have been some articles published, that the Colombians are sent by Mexican cartels - to give the Colombians exposure to modern drone warfare and electronic warfare. This is due to the porosity of Urkaine's slack recruiting guidelines.