Incident involves a soldier reportedly armed with a knife.
Diplomatic ties between Japan and China are under strain.
Tensions have been heightened due to the Taiwan issue.
Strategic angle: A soldier's break-in at the Chinese Embassy in Tokyo exacerbates already tense diplomatic relations over Taiwan.
Incident involves a soldier reportedly armed with a knife.
Diplomatic ties between Japan and China are under strain.
Tensions have been heightened due to the Taiwan issue.