Power outages have hit Russian-occupied parts of southern Ukraine, according to the Moscow-affiliated regional authorities.
"All districts of the Kherson region are fully or partially without electricity," Vladimir Saldo, the head of the region's occupying Russian administration, wrote on Telegram. Energy suppliers and emergency services were working to restore power to households as quickly as possible.
Yevgeny Balitsky, the governor installed by Moscow for the Zaporizhzhya region, also wrote of emergency shutdowns and overnight damage to energy facilities following Ukrainian strikes on the power grid.
Ukraine has been defending itself against a Russian invasion for more than four years and is increasingly putting Moscow under pressure with counter-attacks.
In an interview with Kremlin-friendly state television correspondent Pavel Zarubin, Russian President Vladimir Putin acknowledged problems on Sunday evening.
Putin said it was clear that strikes on critical infrastructure in general and on energy infrastructure in particular were causing problems. He said there was a degree of shortage, but not a critical one.
Ukraine has significantly expanded its attacks in recent months, targeting the Russian oil industry. This has led to fuel supply problems, initially on the Crimean Peninsula - occupied by Russia since 2014 - but now also across a large part of Russian regions.
