Dozens of CIA officers have been afflicted by debilitating symptoms over the past decade. Are they the result of ‘mass hysteria’? Or are they from attacks with an energy weapon and, if so, who is resp...

Exclusive: In her first media interview since fleeing Russia, Rita Flores describes her three years of being run by the FSB

The long read: When exiled Russian opposition campaigner Igor Rogov was accused of working for the Kremlin, his friends were shocked. Could this young activist have really been an undercover agent?

In 2023, Nazar Daletskyi’s apparent remains were buried in his home village. Three years later, he spoke to his mother, Nataliia, on the phone

Drawing on more than 100 interviews with senior intelligence officials and other insiders in multiple countries, this exclusive account details how the US and Britain uncovered Vladimir Putin’s plans ...

People torn between craving for peace as conditions worsen and desire to hold strong against Russian military and US

‘No deal is perfect, but it must be done sooner rather than later,’ says US army secretary in sombre meeting

Ukraine could be forced into an agreement but plan as it stands seems too bizarre for Zelenskyy to sell to his public

Igor Rogov, who left Russia in 2021, due to go on trial accused of informing on other Russian opposition activists

Polish minister says Moscow sought to gauge reaction without starting war as Romania reports new incursion

Refusal to take calls from JD Vance after Zelenskyy-Trump showdown reflects political tightrope ‘war hero’ has walked since being fired as army chief

Zelenskyy forced to U-turn on anti-corruption bodies but protesters know unrest only plays into Russia’s hands

Oleh, 19, was offered $1,000 for a paint attack on a police station – but the bag he was given contained a crude bomb

A deal freezing frontlines would be unacceptable for Serhiy Serdiuk, who was taken to Georgia in handcuffs with his family after refusing to teach the Russian curriculum

For more than a century, Soviet and Russian spymasters have poured enormous resources into the training and deployment of deep-cover spies known as “illegals.” These agents live behind enemy lines for...

Lana Estemirova promised to tell story of her mother, a renowned human rights activist. This month it is published

Exiled Soviet-era dissident tells the Guardian that for the US to turn its back on the territory would be ‘shameful’

Exploding weapons factories, assassination plots and fake news: Vladimir Putin’s hybrid war campaign against the West has stepped up several notches since the full-scale invasion of Ukraine in 2022.

Path to peace looks as unclear as it was before European leaders’ meeting with Zelenskyy in Kyiv

Exclusive account reveals previously unreported details and insights into how Kremlin’s sabotage campaign played out on the ground – and the multinational effort to track down the network behind it

Moscow’s intelligence services have launched a new type of attack on the west, violent but piecemeal and hard to prove

Russia is holding an estimated 16,000 civilians in arbitrary detention at 180 separate facilities. Taganrog was the most notorious.

The Guardian, working with media partners, has tracked down first-hand accounts to reconstruct Viktoriia Roshchyna’s final months

Kremlin’s most prized spies were sent in to Czechoslovakia to whip up the 1960s reform protests in a move then replicated across the eastern bloc

In his new book, “The Illegals,” Shaun Walker studies the Russian agents who worked deep undercover as Americans for decades.

The long read: For the first time, the man the KGB codenamed ‘the Inheritor’ tells his story

Investigative journalist called ‘modern-day Sherlock’ by Alexei Navalny on unsettling photos, reprisals and being exiled from Vienna

Ivan and Maryna’s story is just one of hundreds of thousands of family tragedies that have afflicted Ukrainians after three years of Russian invasion

Exclusive: In extended interview with the Guardian, Ukraine’s president says he will offer US firms lucrative reconstruction contracts to try to get Trump onside

Director of the memorial says he wants the focus to be on the last survivors of the Nazi concentration camp

The US president-elect’s policy on the conflict may prove decisive, but appeasing both sides will be a challenge, writes Shaun Walker

Electricity cable link to Estonia was damaged on Christmas Day in suspected Russian act of sabotage

Depleted army is increasingly made up of older men, but Zelenskyy is reluctant to lower mobilisation age from 25

Letter: Current and former contributors to the international pages of the Guardian and Observer respond to an article by Ole Jacob Sunde, chair of the Scott Trust

President-elect’s strategy on ending war is yet to emerge but interviews with Ukrainian officials and Russians suggest a compromise may be hard to find