Another non-answer.
John Kerry would use something the Bush administration has utterly failed at...its called diplomacy.
This statement is the equivalent of someone asking me how I was going to build a single-stage-to-orbit space vehicle, and my answering them, "I'm going to use engineering."
Sorry, try again. I'll help a bit: what do you think will Kerry actually say and do to get France to commit money and troops? There are actual answers to this if you think about it.
Kerry is damned lucky the idiots in the media won't nail him down like this. Your answer would probably have made headlines.