Russian troops have withdrawn from Chernobyl, says Ukrainian nuclear operator

• CNN Exclusive: After this Ukrainian IT specialist started leaking data from a Russian ransomware gang, he says the FBI asked him to stop
• Watch freed man who was detained by Russia surprise mom at her front door

• CNN Exclusive: After this Ukrainian IT specialist started leaking data from a Russian ransomware gang, he says the FBI asked him to stop
• Watch freed man who was detained by Russia surprise mom at her front door