“Polite fish” is a phe­nomenon and an attrib­ute often met in Asian cul­ture– a situ­ation when two abso­lute oppos­ites are forced to inter­act and in that forced inter­ac­tion show both utmost polite­ness and act with extreme cau­tion.
Russian-Chineese bor­der extends for over 4000 kilometers.