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