Germany debates issue of nuclear weapons / Sweden's Prime Minister: We benefit from the presence of nuclear weapons in Europe / Over half of Poles believe their country should have nuclear weapons -- poll / Trump, Putin could strike informal deal to maintain caps on nuclear weapons -- analyst / West could make 'crazy' move to hand over nuclear weapons to Ukraine -- National Interest / Nobel Peace Prize winner urges Putin to understand the destructiveness of nuclear weapons / Nobel Peace Prize winner urges Putin to understand destructiveness of nuclear weapons / Campaigners against nuclear weapons are far from naive