Nice pic of Evgeny Lyukshin in that image, @TopPocketFind – the man in the middle, standing slightly behind someone.
According to the BBC article linked in the OP, the guy in front of Lyushkin is Russia's Deputy Foreign Minister Alexander Grushko and the picture was taken at a Diplomats' Day event in Moscow in February, where Foreign Minister Sergei Lavrov gave a speech. It was posted by Russia's Ministry of Foreign Affairs.
Lyushkin is 23, and his father was a counsellor at the Russian embassy in Denmark.
From same article:
This means Lyukshin's father was in Europe, potentially with access to and knowledge of sensitive documents. This accords with the Telegram post by EL which stated he had access to Nato and CIA documents because his father had been in Europe.
Lyukshin has been training at the Moscow State Institute of International Relations (MGIMO), a diplomatic academy controlled by the foreign ministry, where Rybar has a "media school".
In a Telegram group of MGIMO students, which Lyukshin was the administrator of, the BBC has found discussion about "conducting pro-Russian propaganda" as part of the course.
Among the public Telegram groups shared between students was Lyukshin's own "The Lost Britain" group, where he had posted in English calling for taxpayer money to be "diverted" to the NHS instead of being spent on "support for Ukraine".