scottsdale. it's saturday night. tyrus? >> saturday, sunday. i'll be defending my world television championship. check it out. catch it on fight network or show up live in nashville fairgrounds! >> ooh, fan. nashville fairgrounds! all right. we're done. thank you to emily, joey, tyrus. i love you, america! >> shannon: -- hello and welcome to fox news @ night, i'm mike emmanuel in washington in for shannon bream. breaking tonight, u.s. intelligence officials believe russian president vladimir putin may threaten to unleash russia's nuclear arsenal if ukrainians hold defense in line of their country. lieutenant general says, "as