In February this year there was an attack against Vodafone Portugal that brought down their whole mobile networks, 4G, 5G, and fiber, taking them several days to bring everything back up [0]. It also very clearly was a state actor, no threats, no ransom, sophisticated.
Taking down pipelines, taking down comms, taking down transport infrastructure. All within a few months. Always on NATO targets, always localized, never claimed with any statements, always sophisticated enough that it would require knowledgeable state actors.
It all seems like a training ground to find out if they can do it and probably a message to NATO members to not assume they are safe.
[0] https://arstechnica.com/information-technology/2022/02/vodaf...