I would argue they don't have much of a choice:

"The economic sanctions put in place as a result of the invasion and the increasingly uncertain security situation make it impossible for Cogent to continue to provide you with service."

I would expect to see others follow suit if that is the case.

On Fri, Mar 4, 2022 at 1:55 PM Michael Thomas <mike@mtcc.com> wrote:

I know the link is paywalled, but it's super high level so not much is
lost. But what does everybody think of this? I imagine that just Cogent
cutting them off isn't going to make much difference.

https://www.washingtonpost.com/technology/2022/03/04/russia-ukraine-internet-cogent-cutoff/

Mike