U.S. President-elect Donald Trump spoke with Russian President Vladimir Putin and advised him not to escalate the Ukraine war, a source familiar with the conversation told Reuters on Sunday, as President Joe Biden plans to urge Trump not to abandon Kyiv, Reuters reported.

Trump and Putin spoke in recent days, said the source. Trump spoke with Ukrainian President Volodymyr Zelenskiy on Wednesday. Trump has criticised the scale of U.S. military and financial support for Kyiv, vowing to end the war quickly, without saying how.

Ukraine's foreign ministry said it was not informed in advance of the call between Trump and Putin and subsequently could neither endorse or object to it.

"We do not comment on private calls between President Trump and other world leaders," said Steven Cheung, Trump's communications director, when asked about the phone call, which was first reported by The Washington Post.

The Russian embassy in Washington did not immediately respond to a request for comment.

Republican Trump will take office on Jan. 20 after defeating Vice President Kamala Harris in the Nov. 5 presidential election. Biden has invited Trump to come to the Oval Office on Wednesday, the White House said.

U.S. National Security Adviser Jake Sullivan said on Sunday that Biden's top message will be his commitment to ensure a peaceful transfer of power, and he will also talk to Trump about what's happening in Europe, in Asia and the Middle East.

"President Biden will have the opportunity over the next 70 days to make the case to the Congress and to the incoming administration that the United States should not walk away from Ukraine, that walking away from Ukraine means more instability in Europe," Sullivan told CBS News' "Face the Nation" show.

Sullivan's comments came as Ukraine attacked Moscow on Sunday with at least 34 drones, the biggest drone strike on the Russian capital since the beginning of the war.

When asked if Biden would ask Congress to pass legislation to authorize more funding for Ukraine, Sullivan deferred.

"I'm not here to put forward a specific legislative proposal. President Biden will make the case that we do need ongoing resources for Ukraine beyond the end of his term," Sullivan said.

Washington has provided tens of billions of dollars worth of U.S. military and economic aid to Ukraine since it was invaded by Russia in February of 2022, funding that Trump has repeatedly criticized and rallied against with other Republican lawmakers, read the report.

Trump insisted last year that Putin never would have invaded Ukraine if he had been in the White House at the time. He told Reuters Ukraine may have to cede territory to reach a peace agreement, something the Ukrainians reject and Biden has never suggested.

Zelenskiy said on Thursday he was not aware of any details of Trump's plan to end the Ukraine war quickly and that he was convinced a rapid end would entail major concessions for Kyiv.

According to the Government Accountability Office, Congress appropriated over $174 billion to Ukraine under Biden. The pace of the aid is almost sure to drop under Trump with Republicans set to take control of the U.S. Senate with a 52-seat majority.

Control of the U.S. House of Representatives in the next Congress is not yet clear with some votes still being counted. Republicans have won 213 seats, according to Edison Research, just shy of the 218 needed for a majority. If Republicans win both chambers, it will mean the majority of Trump's agenda will have a significantly easier time passing through Congress, Reuters reported.

Republican U.S. Senator Bill Hagerty, a Trump ally who is considered a top contender for secretary of state, criticized U.S. funding for Ukraine in a CBS interview.

"The American people want sovereignty protected here in America before we spend our funds and resources protecting the sovereignty of another nation," Hagerty said.

The 2-1/2-year-old war in Ukraine is entering what some officials say could be its final act after Moscow's forces advanced at the fastest pace since the early days of the war.

Any fresh attempt to end the war is likely to involve peace talks of some kind, which have not been held since the early months of the war.

Moscow's forces occupy around a fifth of Ukraine. Russia says the war cannot end until its claimed annexations are recognized. Kyiv demands all of its territory back, a position that has largely been supported by Western allies.

Israeli airstrikes on Lebanon over the last day have killed at least 40 people including several children, Lebanese authorities said on Saturday, after heavy Israeli bombardment pounded the southern suburbs of the capital Beirut overnight, Reuters reported.

At least seven people were killed in the coastal city of Tyre late on Friday, Lebanon's health ministry said. The Israeli military has previously ordered swathes of the city to evacuate but there were no orders published by the Israeli military spokesperson on social media platform X before Friday's strikes.

The ministry said two children were among the dead. Rescue operations were ongoing and other body parts retrieved in the aftermath of the attack would undergo DNA testing to identify them, the ministry added.

Strikes in nearby towns on Saturday killed 13 people, including seven medics from rescue groups affiliated to Hezbollah and its ally Amal, the health ministry said.

At least 20 more people were killed in Israeli strikes on Saturday across the eastern plains around the historic city of Baalbek, the health ministry said.

The Israeli military said it had struck Hezbollah infrastructure sites in the areas of Tyre and Baalbek, including fighters, "operational apartments," and weapons stores.

The Lebanese health ministry said Israeli attacks have killed at least 3,136 people and wounded 13,979 in Lebanon over the last year. The toll includes 619 women and 194 children, read the report.

Israel has been locked in fighting with Lebanese armed group Hezbollah since October 2023, but fighting has escalated dramatically since late September of this year. Israel has intensified and expanded its bombing campaign, and Hezbollah has ramped up daily rocket and drone attacks against Israel.

The Iran-backed group announced more than 20 operations on Saturday, as well as one that it said fighters carried out the previous day against a military factory south of Tel Aviv.

More than a dozen Israeli strikes also hit the southern suburbs of Beirut overnight, once a bustling collection of neighbourhoods and a key stronghold of Hezbollah.

Now, many buildings have been almost entirely flattened, with Hezbollah's yellow flags jutting out from the ruins, according to Reuters reporters who were taken on a tour of the area by Hezbollah, Reuters reported.

Some buildings were partially damaged by the strikes, leading some floors to collapse and sending furniture and other personal belongings spilling onto parked cars below.

Men and women were picking through the rubble for their belongings, shoving blankets and mats under their arms or into black plastic bags.

"We are trying to gather as many (of our possessions) as we can, so we can manage to live off them, nothing more," said Hassan Hannawi, one of the men looking for his belongings.

Russian President Vladimir Putin on Thursday congratulated Donald Trump on winning the U.S. election, praised him for showing courage when a gunman tried to assassinate him, and said Moscow was ready for dialogue with the Republican president-elect.

In his first public remarks since Trump's win, Putin said Trump had acted like a real man during an assassination attempt on him while he was speaking at a campaign rally in Pennsylvania in July, Reuters reported.

"He behaved, in my opinion, in a very correct way, courageously, like a real man," Putin said at the Valdai discussion club in the Russian Black Sea resort of Sochi. "I take this opportunity to congratulate him on his election."

Putin said remarks Trump had made during the election campaign about Ukraine and restoring relations with Russia deserved attention.

"What was said about the desire to restore relations with Russia, to bring about the end of the Ukrainian crisis, in my opinion this deserves attention at least," said Putin.

Trump said during campaigning that he could bring peace in Ukraine within 24 hours if elected, but has given few details on how he would seek to end the biggest land war in Europe since World War Two.

The 72-year-old Kremlin chief gave just one note of caution: "I do not know what is going to happen now. I have no clue."

When pressed by a questioner what he would do if Trump called to suggest a meeting, Putin said he was ready to resume contacts if a Trump administration wanted that, and was ready for discussions with Trump.

Russia and Trump have repeatedly dismissed as nonsense some claims in Western media that Trump was a sort of Russian agent of influence. Russian officials say that during his first term, from 2017 to 2021, Trump was tough on Russia.

U.S. Special Counsel Robert Mueller investigated allegations of collusion between Trump's campaign and Russia in the 2016 U.S. presidential election, but said in a 2019 report that he found no evidence of conspiracy.

Moscow has also repeatedly denied U.S. assertions that Russia meddled in the 2024 and other presidential elections and had spread disinformation in an attempt to sow chaos.

WAR?

The 2-1/2-year-old war in Ukraine is entering what some Russian and Western officials say could be its final - most dangerous - phase after Moscow's forces advance at their fastest pace since the early weeks of the conflict and the West ponders how the war will end.

Putin on June 14 set out his terms for an end to the war: Ukraine would have to drop its NATO ambitions and withdraw all of its troops from all of the territory of four regions claimed by Russia.

Russia controls Crimea, which it annexed from Ukraine in 2014, about 80% of the Donbas - a coal-and-steel zone comprising the Donetsk and Luhansk regions - and more than 70% of the Zaporizhzhia and Kherson regions.

Speaking for several hours on Thursday, Putin railed against the "adventurism" of Western leaders whom he accused of pushing the world to a "dangerous line" by seeking to inflict a strategic defeat on Russia in Ukraine.

"It is useless to put pressure on us. But we are always ready to negotiate with full consideration of mutual legitimate interests," Putin said, just seconds after scolding the West for promising Ukraine and Georgia eventual NATO membership in 2008.

He said that the West had never accepted Russia as an equal partner since the 1991 fall of the Soviet Union, treating it as a defeated power and enlarging the U.S.-led NATO military alliance eastwards towards Russia.

Russia, Putin said, was ready to restore relations with the United States but the ball was in Washington's court. Putin also said that China was Russia's "ally".

Asked about Kamala Harris' warning that Putin would eat Trump for lunch, Kremlin spokesman Dmitry Peskov said with a chuckle: "Putin does not eat people."