China and Japan haven't truly reached the point of knowing each other.
Literal
China-Japan-between [topic-は] truly mutually [object-を] know-each-other point [up-to-まで] [topic-は] has-not-reached.
中日間 (between China and Japan) uses the suffix 間 for 'between.' 知り合う uses the reciprocal ~合う: 'know each other.' ~ところまでは到達していない means 'has not reached the point where' — a measured, diplomatic assessment. 本当に (truly) emphasizes the gap.