Lets look at two truly prestigious universities, Oxford and Cambridge. Both of these institutions have a similar structure. Actually, the university there is called the university administration - the rector's office and the bureaucracy. And the universities themselves are divided into colleges with unique names, such as Trinity. Therefore, a Cambridge graduate will not introduce himself as a Cambridge graduate, but as a Trinity graduate.
For example, Usha Vance (J.D. Vance's wife) graduated from Clare College of Cambridge.
Let's go next. A person attends this college. Here you need to understand that their elite education is history and philosophy in certain faculties of certain colleges for elites, and people from aristocratic families - old school ties (elite public schools for posh dudes such as Rugby or Eton) get to these faculties.
Russian wealthy doesn't know about such nuances. They see that the upper class elite aristocrats there graduated from Oxford College with a degree in Chinese Philosophy. This is a legacy of the colonial times, when their elite members were sent to senior positions in colonies, such as China or India, so that they would know where they were going and what to talk about with the local elite to get some respect.
Russian richmen send unsuspecting children to these faculties. But MI6 is already aware about it. They will never become a British elite aristocrats, their origin will not allow it, but they still can be useful.
The learning process there is interesting. A personal mentor or tutor is attached to you at these posh colleges - you have to give him an essay on a defined topic every week. An approach of rich institutions, not every university can handle it.
So, this tutor is attached to a Russian student. And gradually, slowly, he carefully promotes certain topics and sees how he reacts.
The topics are as follows: how Russians oppressed everyone, how the poor people of Siberia suffered, etc.
You can get good grades if you answer correctly, i.e.: we oppressed everyone, we intimidate everyone, we hanged poor traitors, etc.
We described it roughly, mentors are more delicately and gradually leading to this.
Well, they're watching. If a student quietly caves, then they will recruit him. If he doesn't, he doesn't, then person will just graduate from college. They will recruit only with a high possibility of success.
Then he will be whispered about high society, pleasant acquaintances, this and that, etc.
And this student will be considered as an agent of influence in future.
Most of them are recruited with different perspectives and future promotions, i.e., we will introduce you to the "friends of ours", and a couple of time a person will be invited to a party of some posh moron. Plus, there are all sorts of student clubs that can mob person who is doing not good in their eyes or, encourage, if he moves in the "right" direction.
This is how they corrupt Russian students, let's see how they corrupt others.