Russian ⇄ English

та ну stresses
derog.	pfft (4uzhoj)
inf.	hoo, boy! (a term used to mean "I'm tired," "I've had enough," "I can't believe it," and any number of other negative emotions (с) Liv Bliss)
та ну!
gen.	don't be silly (в соответствующем контексте 4uzhoj)

та ну: 2 phrases in 1 subject

Informal

2