Putin, before vote, unveils 'invincible' nuclear weapons to counter West

By Andrew OsbornMOSCOW (Reuters) - President Vladimir Putin announced an array of new nuclear weapons on Thursday, in one of his most bellicose speeches in years, saying they could hit almost any point in the world and evade a U.S.-built missile shield.Putin was speaking ahead of an election on March 18 that polls indicate he should win easily.It was unclear if he had a particular Russian ally, such as Syria, in mind, but his comments looked like a warning to Washington not to use tactical battl