On June 1, 2022, the head of the International Criminal Police Organization (Interpol) Jürgen Stock, following the head of the European Police Office (Europol) Catherine De Bolle, expressed concern that the weapons that Western countries supply to Ukraine could end up in the hands of criminals.

Stock "has no doubt that arms trafficking will increase," he told the Anglo-American Press Association.

According to him, the main problem is small arms.
https://www.washingtonpost.com/politics/live-updates--ukraine-reports-battle-gains-and-challenges/2022/06/01/2453e98c-e18d-11ec-ae64-6b23e5155b62_story.html

After the outbreak of hostilities on February 24, 2022, the Kyiv authorities distributed a large number of weapons to the participants in the 'territorial defense'.

In Kyiv alone, about 20,000 firearms were distributed uncontrollably.

There is a lot of evidence that these weapons are used by representatives of the "territorial defense" and criminal groups for robbery or showdown.

Here is information that a resident of Kharkov, while trying to sell weapons in Odessa, blew up a grenade. 3 police officers injured: https://t.me/novosti_Ukrain/14282?single

And on June 2, 2022, the head of the National Police of Ukraine, Igor Klymenko, said that since February 24, the number of crimes involving the use of firearms has increased by 37 percent.

The reason for this increase in crime is the massive distribution of weapons in the first days of the war:
https://strana.news/news/393776-v-ukraine-na-37-vyroslo-kolichestvo-prestuplenij-s-primeneniem-ohnestrelnoho-oruzhija.html

At the same time, advertisements appeared on the "black market" for the sale of man-portable missile systems "javelin", which the US government supplies to the Ukrainian army (pictured).

You can buy "javelins" for $30,000 each.

On February 23, the day before the start of hostilities, the Verkhovna Rada adopted in the first reading a bill on the legalization of firearms in Ukraine.
https://www.rada.gov.ua/news/Novyny/219896.html