Appease: To GIVE the enemy something to hope he'll stop. See 1939, when Neville gave half of czech to Hitler so he wouldn't take the other half.
Negotiate: To DISCUSS issues with nations to deter or encourage certain behavior.
Obama would like to NEGOTIATE with terror states. Just as Bush did - with N. Korea as they seek WMD, and with Libya, who Bush himself classified as a terrorist state, then thru quiet backdoor negotiations reached an agreement. Many people also forget that even AFTER we labeled IRAN a terror state, we STILL negotiated with them for terms of Iraqi OIL and security issues.
Obama doesn't want to give the terror states ANYTHING. Just talk, to try to reach agreement. Obviously strength alone isn't stopping them from blowing shit up in iraq, right? Why not talk with them, just as Bush has talked with terror states.
You'll notice a lot of pundits saying "Obama is an appeaser!" but he doesn't want to give them a thing. He just wants to talk, as Bush does. People who say this are ignorant, and I just demonstrated why.