Intense fighting continued in Ukraine over the weekend, particularly in three of the four regions Russia annexed last month. Citizens in the war-torn nation are bracing for a cold winter.

Ukraine's armed forces say Russia targeted more than 30 towns and villages across the country in the 24 hours through Sunday morning. In response, Ukraine carried out 32 strikes and said 24 of them hit Russian targets.

President Volodymyr Zelenskyy released a video calling on Russian soldiers to surrender.

Zelenskyy said, "In the east and the south, we do everything to make the occupiers feel that they have no prospects. No matter who they send to fight against us, it will only end in their defeat."

Zelenskyy said almost 65,000 Russians had been killed since the February invasion. That is more than 10 times Moscow's estimate last month.

A Russian state-run news agency quotes defense officials as saying two people opened fire at a military training facility in the western Russian region of Belgorod on Saturday.

The report says 11 people were killed and 15 others injured. Russia's defense ministry says the gunmen were shot dead at the site. It says they were nationals of an unnamed former Soviet country.

In Ukraine, authorities are calling on citizens to prepare for more blackouts and asked them to cut their power consumption.

They say Russian missiles and drones hit 28 power supply facilities in the three days though Wednesday.

People in Kyiv are buying power generators and gas burners. The average temperature for January is below minus 3 degrees Celsius. A man says he is preparing for winter as there may be power outages.

Authorities are urging people to stock up on warm clothes, flashlights and batteries in case of prolonged blackouts.