At a ceremony in Westminster Hall, the oldest building on the parliamentary estate, Charles used his address to the upper and lower houses of parliament to pay tribute to his mother and to pledge to uphold the principle of constitutional government.

Thousands of people stood for hours on Sunday to see the 96-year-old's coffin arrive from her Balmoral estate to Edinburgh's Palace of Holyroodhouse, and the formal proclamation of Charles as king. 

Pictures of the quartet putting aside their differences to look at floral tributes to Queen Elizabeth II outside her former Windsor Castle residence were splashed across the covers of many of the nation's Sunday papers.

Meanwhile, the Russian-installed chief administrator of Russian-controlled parts of Ukraine's Kharkiv region recommended on Saturday that all its inhabitants evacuate to Russia "to save lives", according to the Russian state-run TASS news agency.

The couple, who were on a rare visit to Britain when the queen died on Thursday, reunited with Harry's brother William and wife Kate at Windsor Castle Saturday. It was their first joint public appearance since they moved stateside in early 2020.

Since the queen's death aged 96 on Thursday, her body has remained at her Balmoral estate in northeast Scotland while her eldest son travelled to London to be formally proclaimed King Charles III.

Speaking for the first time as monarch from Buckingham Palace, the 73-year-old thanked his "darling mama" for her "love and devotion to our family and to the family of nations".

Tributes poured in -- from countries she had ruled over to those she had been at war with, from tiny territories to the mightiest governments on the planet, and from centuries-old institutions to nations that had not yet been born when she took the throne.

"The death of my beloved Mother, Her Majesty The Queen, is a moment of the greatest sadness for me and all members of my family," the new king, her eldest son Charles, said.

Here are some of the tributes to Britain's longest-serving monarch, who is also head of state in 14 Commonwealth countries around the world:

The queen, Britain's longest-reigning sovereign and the world's oldest monarch, has been suffering from what Buckingham Palace has called "episodic mobility problems" since the end of last year.

The WHO welcomed the new front in the fight against the virus -- but also said it wanted to see the data behind the vaccines, to assess whether to aprove them.

Biden, asked by a reporter on Monday if he would blacklist Russia as a terrorist state, said simply, "no," after months of non-committal answers from senior officials.

Putin was meeting with Defence Minister Sergei Shoigu and military chief of staff Valery Gerasimov at the Sergeevski military range and could observe the final phase of the military exercises later, Peskov was quoted as saying.

"We adopted our final decision last Friday and it does contain a fine of 405 million euros," the DPC said in a statement. Full details of the decision will be published next week, it added.

Johnson, who was forced to quit after losing the support of dozens of his ministers, bids farewell from Downing Street before jetting to northeast Scotland to see the 96-year-old monarch.

Soon after it invaded in February, Moscow largely took control of the Kherson and Zaporizhzhia regions of southern Ukraine and is now aiming to absorb them into Russia through referendums -- as it did with Crimea in 2014.

After weeks of an often bad-tempered and divisive party leadership contest that pitted Truss against Rishi Sunak, a former finance minister, Monday's announcement at 1130 GMT will trigger the beginning of a handover from Boris Johnson.

The comments came as the 27-nation European Union prepares to roll out a booster campaign ahead of a feared wave of new coronavirus cases later this year.

Pavel Palazhchenko, who worked with the late Soviet president for 37 years and was at his side at numerous US-Soviet summits, spoke to Gorbachev a few weeks ago by phone and said he and others had been struck by how traumatised he was by events in Ukraine.

"Today at 4:57 am (0157 GMT), due to another mortar shelling by the Russian occupying forces at the Zaporizhzhya nuclear power plant site, the emergency protection was activated and operating power unit 5 was shut down," Energoatom said, referring to the reactor.   

World leaders were quick to pay tribute to the man who oversaw the collapse of the USSR, a pivotal turning point in world history.

Mikhail Gorbachev, the last leader of the Soviet Union who played a major role in ending the Cold War, died in Moscow on Tuesday aged 91.

Zelensky said Russian shelling on Thursday sparked fires in the ash pits of a nearby coal power station that disconnected the reactor complex, Europe's largest such facility, from the power grid.

The picture circulated by Finnish media shows two women kissing, lifting their tops to bare their torsos and covering their breasts with a sign that says "Finland".

Britain said Russia had no moral right to sit at the G20 while it presses on with its invasion of Ukraine.

Russian President Vladimir Putin's intention to show up in person at the upcoming G20 Summit in Bali has stoked fears of renewed pushback from Western member states.

As Widuchowa's residents searched for tools to remove the lifeless bodies from the the river, the government began crisis response that many scientists say came too late.

"Russia has no moral right to sit at the G20 while its aggression in Ukraine persists," the spokesperson said.

A flare-up in fighting around Europe's largest nuclear facility in Russian-controlled southern Ukraine has sparked urgent warnings from world leaders, and UN chief Antonio Guterres cautioned during talks with Erdogan that any damage to the plant would be akin to "suicide".