Ukraine needs extra gas and weapons, President Volodymyr Zelenskyy told the G7 on Monday, as a brutal winter threatens to bring further suffering to millions in the war-torn country.
Many people are facing freezing temperatures without power or heating with snow on the ground and Ukraine's energy grid battered by Russian strikes.
Mr Zelenskyy said Ukraine needed "about two billion cubic metres" of additional gas to get through the winter.
He was speaking on a video conference with the G7 group of wealthy nations on Monday.
He urged the G7 to send more weapons to Ukraine, including "modern tanks", "rocket artillery and more long-range missiles".
Western-supplied weapons have helped to turn the tide in the war, and a senior US military official said on Monday that Russia was probably turning to older, less reliable artillery and rocket ammunition as its newer stocks run low.
But Mr Zelenskyy said: "Russia still has the advantage in artillery and missiles. This is a fact.
"These capabilities of the occupying army are the ones to fuel the Kremlin's arrogance".
Ukraine war latest - in pictures
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The coffin of Valeriy Krasnyan is brought out of St. Michael's Golden-Domed Monastery in Kyiv. Getty Images -
Repairmen work near a residential building damaged following a missile attack in Vyshgorod, outside of Kyiv. AFP -
An elderly man walks in front of a residential building damaged following a missile attack in Vyshgorod. AFP -
A boy kisses a dog while he charges his phone at the heating tent dubbed a Point of Invincibly in Bucha, Ukraine. AP -
A couple uses a laptop in the heating tent. AP -
Workers dig out a tire from the rubble of a destroyed storage building at a grain processing center so they can use it for repairs in Siversk, Donetsk region. Reuters -
The Chernihiv region found itself on the frontline of Russia's invasion in February, when Moscow's forces were attempting to quickly seize Kyiv. Getty -
Russia ultimately retreated from northern Ukraine to focus its attack on the east and south. Getty -
The city of Chernihiv on November 28, 2022 in Chernihiv, Ukraine. Getty -
A worker fits in new windows of a building in Chernihiv. Getty -
People receive food from AFAT - Disaster and Emergency Management Presidency in Chernihiv. Getty -
The people Chernihiv queue up for hot food. Getty -
Oleksandr Antonenko stands on a balcony of his apartment damaged by a recent Russian military strike in Kherson. Reuters -
Mr Antonenko and his mother Liudmyla inside their apartment recently damaged by a Russian military strike in Kherson. Reuters -
A woman walks in an underpass in Kyiv, on November 26, 2022. AFP -
Friends hug after the arrival of a train in the southern city of Kherson. Getty -
Residents sort through donated clothing at an aid centre in Kherson. Getty -
A Ukrainian soldier stands with a machinegun near Liman in the Donetsk region. AP -
Children attend a physical education class at Spilno School in Kyiv. Getty -
A woman embraces her friend, a soldier in the Ukrainian army, in Kherson. AFP -
Residents inspect a crater left by a Russian military strike in the village of Komyshuvakha in the Zaporizhzhia region. Reuters -
Resident Tetiana Reznychenko walks past a work by world-renowned graffiti artist Banksy, on the wall of a destroyed building in the Ukrainian village of Horenka. Reuters -
Ukrainian soldiers fire artillery at Russian positions near Bakhmut in the Donetsk region. AP -
A fisherman sails his boat on the Dnipro as black smoke rises from an oil reserve in Kherson. AFP
Meanwhile, in the strategic Ukrainian port of Ochakiv, officials are hoping the Black Sea naval base can be used to serve to consolidate Kyiv's gains in the southern Kherson region.
After failing to seize the port, Russian troops have been pummelling Ochakiv from the nearby Kinburn Peninsula.
In the fog at the local market, Oleg Klyutshko, 62, said: "I am not afraid of winter … but I would like the strikes to stop. We will survive anything else."
Kyiv says 40 per cent of Ukraine's critical energy infrastructure has been damaged, with wave after wave of Russian attacks.
Ukraine becomes dark patch in night satellite images - in pictures
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A satellite image showing the night radiance of Europe from space on November 23 shows Ukraine in almost total darkness. Photo: Nasa -
People walking in the dark city centre of Kyiv which lost electrical power after Russian rocket attacks. AP -
A man using a head torch to make his way around Kyiv. AP -
An unlit street following missile strikes in Kyiv. Getty Images -
People charge their devices using a power generator in Kyiv. EPA -
Since October, Russia has launched regular strikes on the Ukrainian power grid. AP -
People sit in candlelight in Lviv. Reuters
The Ukrainian Energy Ministry said that Russian missiles had hit all of the country's thermal power plants, while 44 overhead high-voltage power lines had also been affected.
Power company Yasno said supply limits in Kyiv were "significant", with about 40 per cent of resources diverted to critical infrastructure.
Oil and gas company DTEK said its specialists were "constantly looking for equipment to restore the energy infrastructure destroyed by Russia", and had agreed on contracts with European suppliers ABB and Siemens.
"The terror against our power plants forced us to use more gas than expected," Mr Zelenskyy told the G7.
"This is why we need additional support over this particular winter."
Ukrainian President Volodymyr Zelenskyy named Time's Person of the Year - video
The G7 groups Britain, Canada, France, Germany — which holds the club's presidency — Italy, Japan and the US.
G7 leaders agreed on key elements of a platform to co-ordinate financial support for Ukraine, German Chancellor Olaf Scholz said, before a summit in Paris on post-war reconstruction.
Mr Zelenskyy also proposed a special summit, which he called the Global Peace Formula Summit, "to determine how and when we can implement the points of the Ukrainian Peace Formula", which would secure the country's security and territorial integrity.
He invited the G7 nations "as well as other conscientious countries" to "show your leadership".
Mr Zelenskyy also urged Russia "to take a concrete and meaningful step towards a diplomatic settlement".
He called on "the occupier" Moscow to leave Ukrainian territory by Christmas.
"The one who brought the war upon us has to take it away," Mr Zelenskyy said.
