Yandex is just as subservient to the FSB as every other big company in Russland.
They even reached an agreement to share encryption keys.
Not that big tech in the US doesn't have its own unsavory ties, especially ones involving the Russians and the Chinese and the Israelis, but all Russian- or Chinese-based companies are required to pimp themselves to their nation's intelligence services to operate at all.
There are other countries where this happens, too: like Pakistan and Saudi Arabia. But Russia and China are much better at spreading their wings internationally.
It won't be from this, but something'll be the straw that breaks the camel's back eventually.