"We should make it more difficult for Russian diplomats and spies to operate around Europe ... reducing the numbers of Russian diplomats, many of whom are serving agents and just gearing up for a crisis," Polish foreign minister Radek Sikorski said.

"We should make it more difficult for Russian diplomats and spies to operate around Europe ... reducing the numbers of Russian diplomats, many of whom are serving agents and just…

The call comes amid a series of hybrid attacks throughout Europe and the incursion of explosive-laden drones in Germany.