Vladimir Putin boasted yesterday that Russia had the power to launch an 'unpreventable strike' against its enemies in a show of strength following the confrontation with Britain in the Black Sea. The Russian president told a navy day parade in St Petersburg: 'We are capable of detecting any underwater, above-water, airborne enemy and, if required, carry out an unpreventable strike.' It comes as military officials announced tests of advanced new weapons – some of which come from an arsenal Mr Putin has described as 'invincible'. He added: 'The Russian navy today has everything it needs to guarantee the protection of...