Ukraine has announced it has received more air defence systems from Western military allies, as officials in Kyiv asked residents to use electricity sparingly after weeks of Russian attacks on energy facilities.
The new weaponry comes as a question mark hovers over American support for Ukraine ahead of elections which will determine control of the US Congress.
Republicans, who analysts say will win the House of Representatives and perhaps the Senate too, have expressed concerns about the level of spending for Ukraine - although President Joe Biden's White House has vowed "unwavering" support for Kyiv regardless of the vote outcome.
Ukraine's defence ministry meanwhile said it was requisitioning several energy and manufacturing companies of strategic importance to guarantee sufficient supplies for the military to fend off Russia's invasion.
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Attacks by Moscow's forces, including with Iranian-made drones over the past month, have destroyed around 40% of Ukraine's power stations.
Weeks of Russian attacks have caused sweeping blackouts and restrictions on energy use across Ukraine.
"The situation in the power system is tense. We ask all residents of the region to support energy workers in the struggle on the energy front. To do this, use electricity sparingly," city authorities said in a statement.
Those pleas come just one day after Kyiv mayor Vitali Klitschko warned of a possible total blackout in the capital.
The secretary of Ukraine's national security and defence council Oleksiy Danilov said the decision to take over several companies was made "in connection with military necessity".
Mr Danilov said the enterprises include aircraft engine manufacturer Motor Sich working from the partially Russian-controlled region of Zaporizhzhia, and the oil and gas company UkrNafta.
The Ukrainian presidency meanwhile said that, over the last 24 hours, Russia had fired four missiles and carried out more than 24 air strikes across Ukraine.
Meanwhile, Ukraine accused Russia of looting empty homes in the southern city of Kherson and occupying them with troops in civilian clothes to prepare for street fighting in what both sides predict will be one of the war's most important battles.
In recent days, Russia has ordered civilians out of Kherson in anticipation of a Ukrainian assault to recapture the city, the only regional capital Moscow has seized since its invasion in February.
Kherson, with a prewar population of nearly 300,000, has been left cold and dark after power and water were cut to the surrounding area over the past 48 hours, both sides said.
Russian-installed officials blamed Ukrainian "sabotage" and said they were working to restore electricity. Ukrainian officials said the Russians had dismantled 1.5km of power lines, and electricity probably would not return until Ukrainian forces recapture the area.
Kyiv has described the evacuation of the area as a forced deportation, a war crime. Moscow says it is sending residents away for safety.
About 100 disabled children were moved from a medical facility in Dnipriany in Kherson region to the Moscow region, Ukraine's military said. Patients from an elderly persons' home in Kakhovka were also being moved and Russian forces are taking over those facilities, it said.
Kherson lies in the only pocket of Russian-held territory on the west bank of the Dnipro River that bisects Ukraine. Recapturing it has been the main focus of Ukraine's counter-offensive in the south, which has accelerated since the start of October.
The situation inside Kherson could not be independently confirmed. Ukrainian forces on the nearby frontline have told Reuters they expect a bitter fight against Russian troops determined to exact a blood price before being forced out.
Ukraine's military said Russian forces, "disguised in civilian clothes, occupy the premises of civilians and strengthen positions inside for conducting street battles".
Russian forces were "involved in looting and theft from residents and from infrastructure sites and are taking away equipment, food and vehicles to the Russian Federation," it said in an update tonight.
Reuters was seeking comment from Russian authorities on the Ukrainian allegations. Moscow denies abusing civilians.
Ukrainian President Volodymyr Zelensky said tonight that Donetsk region in the east remained the "epicentre" of fighting, with hundreds of Russians being killed every day.
The towns of Bakhmut and Avdiivka are the focal points of the heaviest fighting in Donetsk region.
Russian President Vladimir Putin said that 50,000 Russian soldiers called up as part of his mobilisation drive were now fighting with combat units in Ukraine, the Interfax news agency reported.
Mr Putin said 80,000 were "in the zone of the special military operation" - the term Russia uses for its war in Ukraine - and the rest of the almost 320,000 draftees were at training camps in Russia.
"We now have 50,000 in their combat units. The rest are not taking part in the fighting yet," Interfax quoted Mr Putin as saying during a visit to the Tver region, outside Moscow.
In September, Mr Putin announced a "partial mobilisation" drive to call up hundreds of thousands of new fighters for the war after Ukraine recaptured large swathes of territory in a counter-offensive. The move triggered an exodus of hundreds of thousands of Russians and triggered anti-war protests across the country.
Last week Mr Putin said a total of 318,000 had been called-up in the draft. Russia ended the partial mobilisation drive at the end of October, with defence minister Sergei Shoigu saying on 28 October that around 41,000 Russian fighters had already joined their combat units fighting in Ukraine.
