In the battle to become prime minister, both Liz Truss and RIshi Sunak have vowed to crack down on Britain’s enemies. As China bullies Taiwan and Russia bombards Ukraine, whoever wins is likely to see their resolve tested from day one in No. 10. What is less clear is how either candidate would deal with the tricky issue of Britain’s ‘frenemies’: those countries that say warm words about the West but can’t always be trusted.