- The Pentagon said Thursday efforts to set up calls with top Russian military officials had been ignored. - It comes as Russian jets operate close to NATO borders with Ukraine increasing chances of a miscalculation. -'We've made multiple attempts here but they have not answered up,' said Pentagon spokesman John Kirby. - It means the world's two largest nuclear powers are in the dark about each other's moves. - Kirby also said Ukrainian armed forces had pushed Russian ground forces further back from Kyiv. Multiple attempts by Washington's top military leaders to speak with their Russian counterparts have...