Hmmm well depending on the country you are from this has one term or another.
In Russian it's "Околофутбола" or "close to football", in the English-speaking world it's known by the term "ultra".
In general, they are the typical people who go to cheer for a football team (usually, but there are other sports), it is common for them to have an ideology. In the case of Russia, they are all quite patriotic.
Eastern hooligans are quite serious in their thing, many top martial artist have/still belong to a ultras "firm"
In the armies of Europe, and taking into account that many people who join the army are nationalists, it is common for many ultras to be professional military personnel. Russia is no exception and many already participated in 2014. For example, this guy apart from the Wagner patch and the medal wears another patch "ТШТП", which indicates that he is an ultra of Spartak Moscow.
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In Ukraine, Azov was formed from nationalists and ultras of the Metalist Kharkiv team, so in general, it is a tried and tested formula.
It is little known, but another of the most famous units of Europe's recent wars, Yugoslavia's famous "Arkan Tigers" had their origin in Delije, an ultra group of Red Star Belgrade.
The main thing in an elite shock unit I think is motivation and they because of their ideology and let's say "militia" past are a good candidate.
Besides the 106th VDV there is another unit formed by ultras, known as the Española, this one has had combat, in fact they were present in Ugledar where they lost some members. Española must be around the 900 members, but they said they are taking in more, amusingly, despite being a nationalist formation, they are one of the few in all the armed forces with women at the front, as snipers ...
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The core of Española is Army veterans, they took part in Mariupol battle, and took the Azov stadium from them, now belongs to them ...
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Poetic in a way ...