1. the company moved to countries with higher multipliers (i.e. with the same profit, the Dutch or German company is worth several times more than the Russian one). The current outbreak of Russophobia and panic associated with sanctions has given a unique chance to do such a relocation. They write that 800 employees agreed to move in 2022. How many would have agreed in 2021 or 2014?
2. in Russia, quite a few of the employees are local citizens. Some of them had their own homes. By getting a better offer, they could change jobs in 2 weeks. In Holland (Cyprus, Germany, ...), they need a residence permit for 1 year, tied to a specific employer. If they decide to change jobs, the new employer has to go through a months-long bureaucratic process, comparable to the process of initial migration from Russia - and this process does not guarantee a successful conclusion. And all these months they will have to pay for rented housing. And the previous (1 year, remember?) permit can expire during this process, which threatens deportation. That is, the employees have become much more dependent on the company, they will not scatter in the event of a major reorganization, cost-cutting (for the sake of morality and democracy, of course), etc.
This all looks like preparation for the sale of JetBrains. I would bet that this will happen in the coming months. The difference between 2014 and 2022 is somewhere in here, not in who attacked whom and when.
(the above is a subjective perception of their text and pure speculations, based on personal experience in a similar relocation of an IT company from Russia to EU short before 2014)