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Allegations that Ukraine has chemical and biological weapons leave Kyiv fearing ‘false flag’ attempt
Biden raises alarm over potential use by Russia as norms against such munitions seem under threat
President’s comments follow US officials saying Moscow could resort to biological warfare
Evidence points to Assad regime’s responsibility for attack that injured 12, says watchdog
Figures from the Kremlin, defence ministry and intelligence agency subject to travel bans and asset freezes
Germany and France propose targeted move against officials linked to attack on Kremlin critic
UK joins Berlin in urging Russia to provide ‘answers’ for use of banned chemical weapon on Putin opponent
Vanished chief operating officer of fraud-hit payments group hinted at secret service links
UK’s outgoing PM criticises ‘irresponsible’ activity during frosty talks on fringes of G20
Moscow refuses to extradite citizens despite strong evidence of crimes
Home secretary wants to plug ‘real gaps’ in legislation to hold off hostile states
It is only a matter of time before a more virulent strain emerges if states keep blundering in the Middle East
Report says state media spread seven different conspiracy theories about the attack
Move likely to stoke diplomatic tensions with Moscow
The cold war ‘rookie’ reveals its deadly strength
Western powers say attack was faked as pretext to launch air strikes on rebels
Push for further measures on cyber crime amid divisions over approach to Russia
Relations with Russia high on bloc’s agenda amid divisions over how to deal with Putin
Online news sites claim man with ID for Alexander Petrov is in fact Alexander Mishkin
West ratchets up pressure amid determination to expose Moscow intelligence agency
Timeline of events in The Hague, where OPCW was verifying Skripal nerve agent
Seven alleged agents indicted in US after Dutch say cyber attack foiled
Indictment says intelligence officers targeted groups including Fifa, doping agencies
London steps up pressure on Moscow after Salisbury novichok poisoning
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