Video shows Russian tourists fleeing blasts at Russian air base in Crimea
The explosions could represent a significant escalation in the war in Ukraine, analysts suggest.
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Ukraine MOD: Russia is using controversial butterfly mines in Ukraine
They were widely used by Soviet forces in Afghanistan where they maimed large numbers of children who mistook them for toys.
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Russia Smoke cloud shows attack on Russian air base in Crimea, authorities say
Witnesses say they heard explosions near Saky Air Base in the annexed Crimean Peninsula, where one person reportedly died.
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Ukraine Ukraine: Russia advances only 10km in Donbas region, MOD says
Russia has continued attacks on Ukrainian positions in Donetsk and reinforced defences in Southern Ukraine.
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USA US pledges extra $1bn of arms to Ukraine
The pledge comes as analysts warn that Russian forces were moving to the southern port cities to prevent a Ukrainian counter-offensive.
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Aircraft US F-22 Raptor v Russian SU-35 Flanker – which jet is better?
We have looked at how the high-performance multi-role aircraft compare.
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Ukraine Ukraine calls for more 'game-changer' HIMARS weapons to hit Russia
Ukrainian forces are preparing for a possible counter attack in the south of the country.
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Ukraine US says Russia trying to fabricate evidence in prisoner-of-war deaths
US intelligence officials claim Russia is looking to plant false evidence to frame Ukrainian forces for the attack.
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Cyber The cyber lessons from Ukraine
In a war of tanks and artillery, how well have the newest warfare strategies been used?
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Ukraine Why is Ukrainian port city of Kherson so important?
The city was captured by the Russians in early March, not long into the invasion, and has been a focus for the Ukrainians.
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Weapons and Kit What is the Pion artillery weapon used in Ukraine?
The tracked heavy gun is used by both sides and has a range of 37.5km.
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Russia Drone explosion hits Russia's Black Sea Fleet HQ, cancelling Navy Day holiday
The explosion in the city of Sevastopol caused the cancellation of observances of Russia's Navy Day holiday.
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Army UK would run out of ammunition 'in two weeks' in a war against Russia
The UK has gifted so much equipment to Ukraine it would have a "shortfall" of its own, the Defence Committee chair says.
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Russia Russia has 'definitively lost initiative' in battle for Donbas
Officials believe that Moscow will not take the Ukrainian eastern industrial heartland in the "immediate future".
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Ukraine Why is Russia using surface-to-air missiles to hit ground targets?
Is the use of S-300V weapons in Ukraine a sign of Russian desperation?
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Ukraine Ukraine: US-supplied HIMARS take down key bridge in Russia-occupied south
The Antonivskyi Bridge has been seriously damaged following an attack by Ukrainian forces.