Russia is making a 'very costly' tactical mistake that means its second line of defense will be easier to penetrate, analysts say

Russia is making a 'very costly' tactical mistake that means its second line of defense will be easier to penetrate, analysts say

A Ukrainian soldier of 42nd Separate Mechanized Brigade putting camouflage on a tank's muzzle.Yan Dobronosov/Global Images Ukraine via Getty Images <ul> <li>Russia has built complex layers of defens… [+2932 chars]

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