Yandex’s parent holding company was Dutch, and Nebius is now the same. A lot of their employees were effectively transferred between the two. Nebius is basically still just Yandex, just rebranded and legally a different entity.
It’s also by many accounts a bit of a weird company to work for, but they can afford to pay above-market for many roles.
Not too well known, but Yandex very suddenly moved almost all of their employees + families to Israel, and then on to the Netherlands (where they already had an office and a company called "Nebius" to avoid sanctions against Russia) and US.
Certainly looks like they were trying to get out, and were rich enough to actually pull it off (that can't have been cheap). Also they deserve some serious kudos for actually trying to protect them.
I have no clue about the reasoning behind the decision. I'm not associated with the company, just know some employees. The feeling is that many more people were taken along than necessary.
It’s also by many accounts a bit of a weird company to work for, but they can afford to pay above-market for many roles.