Negotiations proceed very slowly until the Japanese attack Chinese forces outside Beiping on 8 July (the Marco Polo Bridge Incident), and the fighting escalates into full-scale war with Japan.

• 在日本军队发动卢沟桥（马可波罗桥事变）事变之前，合作进程十分缓慢。局部战争最终演化为全面战争。