Beriev A-50: Russia's airborne early warning aircraft that's fallen prey to Ukrainian missiles
The A-50 can detect threats and direct attacks, but as few as eight are thought to still be in service, and not all of those are flying.
Russia
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Russia Russia knocked out GPS to RAF aircraft carrying Defence Secretary, Downing St confirms
An aircraft carrying Mr Shapps as he was returning home from Poland was targeted by Russia through electrical interference.
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Weapons and Kit RPG-7: The iconic Soviet weapon used by soldiers, terrorists and militias around the world
This Cold War-era weapon is still in widespread use on the modern battlefield due to its robust design and innovative shaped charge warhead.
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Ukraine Ukraine's quick building of defensive positions slowing down Russia on frontline
The MOD says it is highly likely the expansion of defensive lines will reduce Russia's ability to advance or exploit tactical gains.
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Special forces Ship killers: Ukraine's mysterious Group 13 special forces unit terrorising Russian warships
The special forces unit known only as Group 13 has claimed responsibility for attacking Moscow's most modern warships.
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Russia Sitrep: German leak down to officers' 'arrogance' - and Russia could do the same to UK
A former Army intelligence officer says some Nato officers feel they don't need to stick to the rules, and that's being exploited by Russia.
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Opinion Get defence wrong and tax cuts won't matter – we need armoured mass now
Ex-Nato commander Hamish de Bretton-Gordon warns the Budget's lack of defence announcements is concerning and gives Russia the initiative.
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Ukraine Russian air force losing combat aircraft 20 times faster than they can be replaced
The country has lost numerous aircraft over a short period, including several advanced aircraft and bombers.
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Land vehicles Tank Museum's archive manuals help firm replenish armoured vehicle tracks for Ukraine
The museum in Bovington provided resources for William Cook Defence Limited to reverse-engineer Soviet-era tracks for Ukraine.
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Ukraine Watch: Dramatic moment Russian warship explodes in Special Forces drone attack
The Ukrainian Special Forces unit known only as Group 13 said it destroyed the Sergei Kotov, which belonged to Russia's Black Sea Fleet.
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Ukraine Alleged German air force leak claiming UK personnel on the ground in Ukraine 'worrying'
The revelations were made public by Russia, which had been eavesdropping on a telephone conversation between various Luftwaffe officers.
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Nato Nordic Response 24: UK Commandos train to defend frozen terrain against invasion
Royal Marines, British Army Commandos and the Commando Helicopter Force are taking part in the exercise, formerly Cold Response, in Norway.
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Ukraine Sitrep: Russia using 'a massive sledgehammer to crack a pretty small nut' in Ukraine
Colin Freeman, a correspondent at the Daily Telegraph, spoke to the Sitrep podcast about how Russia's small gains come at a high price.
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Nato Nato would defeat Russia quickly, looking to the future and more: Five key points from CDS' speech
The head of the Armed Forces hailed Nato's strength in a speech at Chatham House as he said the UK is not on the cusp of war with Russia.
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Ukraine Ukraine's frontline breakdown: Five of the biggest battles explained
The Ukrainian and Russian war has reached its second anniversary and five major offences have been launched by Moscow.
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Russia UK Armed Forces chief: We are not on the cusp of war with Russia
Chief of the Defence Staff Admiral Sir Tony Radakin was speaking at the Chatham House Security and Defence conference.