Vladimir Putin approved to use military force outside of Russia
It comes after Putin called for an end to Ukraine's efforts to join NATO and the recognition of Crimea as part of Russia.
Ukraine
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Russia Clear fact that Russia has broken international law, Defence Secretary says
Images of heavy armour have prompted fears Russian tanks may already have crossed the border into Ukraine.
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Russia Ukraine-Russia: Boris Johnson says Vladimir Putin is 'bent on full-scale invasion'
The PM has vowed to swiftly introduce the "first barrage" of sanctions against Russia as tensions with Ukraine rapidly escalate.
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Ukraine PM: Putin's decision to recognise separatist Ukraine states 'a very ill omen'
Boris Johnson was considering whether the actions could trigger the imposition of fresh sanctions on Russia.
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Ukraine Attack on Ukraine 'highly likely' despite possible Putin-Biden talks, Truss warns
Foreign Secretary Liz Truss has warned the price of invasion for Russia must be set "intolerably high".
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Russia Elements of Russian playbook becoming evident, PM's official spokesman says
Prime Minister's spokesperson said Russia "intends to launch an invasion and President Putin's plan has, in effect, already begun".
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Ukraine Russia extends military drills near Ukrainian border
The exercises were initially set to finish on Sunday.
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Ukraine A Russian invasion of Ukraine could lead to largest conflict since WW2, PM warns
Boris Johnson admitted hard-hitting financial sanctions may not be enough to prevent invasion.
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Russia US reassures Baltic nations amid warning Russia is 'poised to strike'
It comes as Western officials have warned that Moscow could invade Ukraine at any time.
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Ukraine Ukrainian military officials come under shelling attack on front as invasion fears increase
It happened in war-torn eastern Ukraine, where the West fears a spike of violence might be used as a pretext for a Russian invasion.
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Ukraine PM says shock will echo around the world if Russia invades Ukraine
Boris Johnson said the "disaster" of a war in eastern Europe could still be avoided by diplomatic means.
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Estonia 'Shouldn't underestimate' importance of British Army's Estonia deployment
1 Royal Welsh have been training in Sennelager, Germany, before joining the Royal Tank Regiment in Estonia amid tensions involving Russia.
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RAF Johnson visits RAF base as situation at Ukraine-Russia border remains 'very grim'
During the Prime Minister's visit to RAF Waddington, he said an invasion of Ukraine would result in a "bloody and protracted conflict".
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Russia Russia accused by UK and US of continuing military build-up near Ukraine
The UK's military intelligence chief said there have been sightings of extra armoured vehicles, helicopters and a field hospital.
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Army UK troops expected to return to Ukraine if security conditions are met
Armed Forces Minister James Heappey said "it's an expectation" UK troops will return once "conditions are met".
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Estonia UK military doubling troop presence in Estonia
Personnel and hardware have been deployed in response to tensions involving Russia.