Russia used chemical weapons before, with no compunction, historian says
Concern should be raised, she says, in relation to Putin's tactics which see him accusing enemies of doing what he is about to do himself.
NATO
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NATO Four US soldiers die in plane crash during NATO Arctic exercise
The personnel were taking part in Exercise Cold Response 2022, with the crash unrelated to the Ukraine war.
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Army Royal Welsh take over as lead UK battlegroup on NATO's eastern flank
They took over from the Royal Tank Regiment at a transfer ceremony in Estonia.
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NATO F-35s and Poseidon aircraft depart for major Arctic exercise
The F-35s will work alongside the Royal Navy's HMS Prince of Wales during Exercise Cold Response 22, but will not operate from the vessel.
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Ukraine Ukraine: French jets in Estonia to bolster NATO airpower in Baltics
Additional jets are joining the Quick Reaction Alert team to deter Russia and protect NATO's eastern flank.
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Ukraine UK sending high velocity anti-aircraft missile system Starstreak to Ukraine
Defence Secretary Ben Wallace met with NATO defence ministers in response to Russia's invasion of Ukraine.
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Operations What is the Joint Expeditionary Force?
The JEF is a northern European security coalition of mainly Nordic and Baltic countries, led by the UK.
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Ukraine PM: No way Ukraine will join NATO
Ukraine is involved in peace talks with Russia, with defence intelligence suggesting the Kremlin's forces are stalling.
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Navy HMS Prince of Wales at the centre of largest Arctic exercise in 30 years
The Royal Navy aircraft carrier is currently serving as NATO's command ship and sailed north to the Arctic for Exercise Cold Response.
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NATO Croatia criticises NATO after drone crash in Zagreb
The drone is thought to be a Soviet-era Tu-141 Strizh, believed to have flown all the way from the Ukrainian war zone.
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Ukraine Russia continues heavy shelling amid slow advance towards Kyiv
It is believed thousands of soldiers on both sides have been killed, along with many Ukrainian civilians.
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RAF Rare access into NATO's frontline air policing sorties over Romania
We joined one of NATO's air policing missions over Romania – a response to Russia's invasion of Ukraine.
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Ukraine How can spy planes help in the defence of Ukraine?
Analysts stationed on the plane and at the base assess the information gathered and turn it into "intelligence" about Russian movements.
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NATO The eyes of the world are upon you, Labour leader tells NATO troops
Sir Keir Starmer spoke to soldiers during a visit to Tapa military base in Estonia.
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Navy HMS Diamond flies NATO flag after joining maritime group
The Type 45 destroyer is deployed as part of the Standing NATO Maritime Group (SNMG2).
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Ukraine What is the difference between offensive and defensive weapons?
Defence Secretary Ben Wallace has said "lethal and non-lethal aid" will continue to be provided to Ukraine.