Joe Saward, a F1 Journalist who lives in France was affected by this too, so it was definitely more widespread than just Ukrainian access.
https://joesaward.wordpress.com/2022/03/05/apologies-for-being-quiet/
"I live in rural bliss in France. The mobile phone coverage is non-existent. Sadly, Mr Putin and his chums took out the satellite I use to get Internet access (strange but true).
Thus life is a bit complicated until a new service provider get things up and running.
(This was written on an iPhone, while I sat in the dark under a mobile phone tower… I’m off home now…)"