中俄北京条约

• 口(mouth; rectangular frame)ASSOCIATIVE
• 丨(vertical line through the middle; axis)ASSOCIATIVE

An arrow hitting the center of a target frame is the bull's-eye—that's CENTER.

• ⼔(person turning back; figure of person from behind)ASSOCIATIVE

Two people standing back-to-back represent North, the direction ancients faced away from.

• 木(tree; wood)RADICAL
• 夂(footstep; follow)ASSOCIATIVE

Tree branches droop down in successive steps like footprints, forming clauses or provisions.

• 糹(thread; silk thread)RADICAL
• 勺(spoon; scoop)PHONO-SEMANTIC

Using a thread to tie things together like scooping water suggests the idea of binding, restraint, and covenant.