The United States and its nuclear allies rebuked Russia on Monday for “irresponsible and dangerous” talk about possibly deploying nuclear weapons as a review of the keystone nuclear treaty opened at the United Nations. “Following Russia’s unprovoked and unlawful war of aggression against Ukraine, we call on Russia to cease its irresponsible and dangerous nuclear rhetoric and behavior, to uphold its international commitments,” said the United States, France and Britain in a statement. “We call on Russia to cease its irresponsible and dangerous nuclear rhetoric and behavior, to uphold its intern…