Russia's Armata tank will be formidable but expensive

Armata tank will be powerful and fast but high costs and defence spending pressures may limit procurement

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US defence budget will balance Middle East and Asia

A focus on administrative costs allows the Pentagon to pursue near- and long-term priorities, but politics may intervene

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Tsipras's visit will yield little practical result and there will be no radical reorientation towards Russia

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The failure of diplomatic efforts to resolve the crisis in Yemen has prompted Saudi-led military intervention

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Growing drone sales to South-east Asia will exacerbate geopolitical risks

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Cyber will establish itself as a key security threat, as governments grapple with proper responses

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Russian denial of involvement in Donbas might evaporate in event of US weapons to Ukraine

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Drones will spark disputes over privacy, but military variants will see high export potential

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The 2015 military budget released next month is likely to rise yet again, even as GDP growth slows

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Shia popular forces have been crucial in the fightback against Islamic State but pose a longer-term security threat

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