Your question doesn't seem complete. Is this the entire question?
Explain the parallels and symbolism between distraction of the Turks approaching Venice and Iago's deceptions.
If it is, here is the answer:
The Turks pretend to sail toward to mislead Venetians into thinking they won't attack Cyprus.Iago is attacking other characters and they are very unaware of the attack coming just like they are unaware of the Turks coming.
