smoothly - adv. without any problem delay and with ease

summit - n. highest level

denuclearization - n. removal of nuclear weapons

conversation - n. a talk involving two persons, parties

course - n. path or direction

achieve - v. to reach a goal

desperately - adv. having a strong need or desire to do something

unwavering - adj. continuing in a strong and steady way

address - v. to deal with an issue, problem

challenge - n. a difficult task or problem