Aon Plc is investigating a “cyber incident” that the insurance brokerage said impacted a limited number of its systems.

The incident, identified Friday, “has not had a significant impact” on operations at Aon, the world’s second-largest insurance brokerage, nor does the Dublin-based company expect it to, according to a regulatory filing Monday. An Aon representative didn’t immediately respond to a request for comment.

The incident comes amid global concerns about malicious activity in cyberspace following Russia’s invasion of Ukraine. Ransomware gangs have pledged allegiance to the Russian government, while activist groups have targeted pro-Russian organizations in an attempt to help Ukrainian forces.

It’s unclear if the incident at Aon is related to the conflict. Cyber insurance providers such as Aon hold valuable data about digital-extortion efforts, including names of victims and sensitive details about attack techniques that are rarely made public.