Internet services have been heavily impacted in the Ukrainian cities of Kherson and Kharkiv due to Russia's unprovoked invasion.
Connectivity from Internet service providers Volia and Skyline fell nearly entirely, possibly due to power cuts.
"A collapse of connectivity has been observed on Internet provider Skyline in Kharkiv, Ukraine; the company says that the server which issues IP addresses is down due to a power cut, and subscribers should not restart devices," Internet outage tracker NetBlocks said.
Kharkiv, in northeast Ukraine, has been under constant bombardment since the beginning of the conflict, nearly a month ago.
NetBlocks continued: "Internet connectivity on provider Volia in Kherson in south Ukraine has collapsed; real-time metrics show connectivity at two percent of pre-war levels; provider reports outages due to power cuts, which come amid anti-occupation protests."
The port city of Kherson was one of the first to fall to Russian forces, but fighting continues as residents protest the illegal occupation.
Earlier this month, a cyberattack on ISP Triolan caused an outage lasting more than 12 hours, while Ukraine's national telecoms operator, Ukrtelecom, went down for 40m in a nationwide outage.