The Foreign Office is urgently investigating reports that three British former special forces officers were killed in the Russian air strike at the Yavoriv base near the Polish border on Sunday.
Officials are understood to be liaising with Ukrainian authorities and international partners to establish further information.
According to the Daily Mirror, the three men killed by the cruise missile attack were not part of the foreign fighters unit that was being trained at the base, which is only six miles from the Polish border.
Their identities have not been revealed and it is not known which branch of special forces the men had served in.
Military experts said the attack on Yavoriv – which left at least 35 people dead – was an attempt by Russia to warn off foreign fighters and halt the flow of military equipment from the West into Ukraine.
Follow the latest updates below.
02:11 AM
Ukrainians struggle to stay alive amid attacks
German Chancellor Olaf Scholz said there could only be a diplomatic solution to the conflict in Ukraine and called on Russia to immediately stop its attacks on the country.
Mr Scholz said during a visit to Turkey that “with each day, with each bomb, Russia is moving further away from the international community”.
02:01 AM
Putin in contact with Israeli PM
The Kremlin says President Vladimir Putin has had another call with Israeli Prime Minister Naftali Bennett to talk about Ukraine.
Mr Bennett told Putin about his contacts with other heads of states, and Putin shared his assessments of talks between Russian and Ukrainian representatives via video calls, the Kremlin said.
A senior Israeli official said Mr Bennett’s conversation with Putin lasted 90 minutes, with discussions focusing on ceasefire talks and humanitarian issues. The official spoke on condition of anonymity to discuss diplomatic matters.
Mr Bennett’s office later said that the prime minister also spoke with Ukrainian President Volodymyr Zelensky on Monday.
Mr Bennett has visited Moscow for talks and has had numerous phone calls with Putin, Mr Zelensky and Western leaders as he seeks to mediate an end to the war in Ukraine.
01:58 AM
Israel to set up hospital for Ukrainian refugees
Israel plans to set up a field hospital to provide medical treatment for refugees in western Ukraine, officials said on Monday.
The project is spearheaded by the country’s foreign and health ministries, according to a statement from Israeli Prime Minister Naftali Bennett’s office. The hospital should be operational by next week, the foreign ministry said.
“It’s an initiative that not many countries can take upon themselves, and Israel has this ability and we are going forward,” Mr Bennett said.
The Foreign Ministry said the hospital will operate for a month, providing refugees with an emergency room, a delivery room, and other services.
It has dubbed the operation Kochav Meir – Hebrew for “Shining Star” – after the country’s first female prime minister, Golda Meir, who was born in Ukraine and founded the Foreign Ministry’s international development unit.
Israel has good relations with both Ukraine and Russia and has worked as an intermediary between the two countries since Russia invaded. In recent days, however, Foreign Minister Yair Lapid has become increasingly outspoken in his condemnations of Russia’s invasion of its western neighbour.
01:20 AM
Zelensky: Peace talks were ‘pretty good’
Ukraine’s president said late on Monday night that negotiations with Russia had been “pretty good” as he said further talks between the two sides were planned for Tuesday.
Volodymyr Zelensky also said he spoke with Israel’s prime minister, Naftali Bennett, as part of a negotiation effort to end the war with Russia “with a fair peace”.
“Our delegation also worked on this in negotiations with the Russian party,” Mr Zelensky said in his nightly video address on Telegram. “Pretty good, as I was told. But let’s see. They will continue tomorrow.”
Mr Zelensky also used his address to thank the Russian state TV employee who interrupted a broadcast on Monday night to protest against the war.
Marina Ovsyannikova shouted out “no to war” and held up a placard saying: “Don’t believe the propaganda. They’re lying to you here.”
Mr Zelensky said he was “grateful” to Ms Ovsyannikova for “trying to deliver the truth”.
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01:03 AM
Russian armament tycoon’s €140m yacht ‘immobilised’
Spain’s prime minister said authorities in Barcelona had immobilised an 85m (279-foot) superyacht valued at €140 million while links to a prominent Russian armament tycoon are investigated.
The boat, named Valerie, has been moored at an exclusive shipyard in the port.
The yacht is connected through an intricate network of shell companies to Sergei Chemezov, the head of the Rostec state defence conglomerate, according to a consortium of journalists who last year investigated the so-called Pandora Papers involving the murky financial deals of the world’s richest people.
Chemezov is a former KGB agent who has long been close to Russian President Vladimir Putin. The European Union last week included him in a list of sanctioned individuals over Moscow’s war on Ukraine.
“We have temporarily immobilised a yacht of one of Russia’s most prominent oligarchs, and there will be more to come,” Prime Minister Pedro Sanchez said late on Monday during an interview in LaSexta television.
12:37 AM
Ill-tempered debate over fresh EU sanctions against Russia
The European Union announced late on Monday that the 27-nation bloc had approved a fourth set of sanctions to punish Moscow for its invasion of Ukraine.
France, which holds the EU presidency, said in a statement that the bloc approved a package targeting “individuals and entities involved in the aggression against Ukraine”, along with sectors of the Russian economy.
EU ambassadors only agreed on a fourth round of measures against the Kremlin after marathon negotiations in Brussels.
The sanctions were given the green light after a long and ill-tempered debate between increasingly divided member states.
READ MORE: Fresh EU sanctions against Russia agreed after heated row