Why the new emphasis on sticks instead of diplomatic carrots?(original)
Question: is this a grammatically correct complete sentence?
I guess the original as : ""Why is the new emphasis on sticks instead of diplomatic carrots?"", this is a question ，its declarative sentence is such as:
The new emphasis is on sticks instead of (on) diplomatic carrots?"
Is my guess correct?

Question

Why the new emphasis on sticks instead of diplomatic carrots?(original)
Question: is this a grammatically correct complete sentence?
I guess the original as : ""Why is the new emphasis on sticks instead of diplomatic carrots?"", this is a question ，its declarative sentence is such as: 
The new emphasis  is on sticks instead of (on) diplomatic carrots?"
Is my guess correct?

Answer

I don't disagree with guidedog. However I would argue that the original sentence (or phrase) is valid, even though it may not be complete.

I'm not certain as to the specifics. I believe there is either an understood verb, or that it's a rhetorical construction that works without the verb.      I'll make up an example to demonstrate:

"You've been complaining about everything since you got here. Why all the whining?"

Answer

Yes. There is no verb so the original is more of a title and is not a complete sentence.