Microsoft has issued an alert about "active attacks" on server software used by government agencies and businesses to share documents within organizations, and recommended security updates that customers should apply immediately.

The attack killed two people and wounded 15, including a 12-year-old, Ukrainian President Volodymyr Zelensky said.

The Defense Ministry in Moscow said in posts to Telegram that 132 Ukrainian drones were downed overnight and into Sunday afternoon. The interceptions took place over at least nine