The head of Nato has slammed Donald Trump for endangering the lives of US and European soldiers by suggesting that Russia should do “whatever the hell they want” to members of the military alliance. Jens Stoltenberg said that Trump’s comments, where he said that the US should not give protection to allies who fail to spend enough on defence, “undermines all of our security”. Speaking at a rally in South Carolina on Saturday, the likely Republican candidate said he would “encourage” Vladimir Putin to attack Nato members who are failing to meet the alliance’s agreed defence spending target of 2 …