Small-State Buffer Diplomacy / 小国夹缝外交
Small-state buffer diplomacy / 小国夹缝外交 is the pattern 《资治通鉴·周纪》07丨两起刺杀（1） draws from 郑国’s position between 晋国 and 楚国. The source argues that Zheng’s apparent inconsistency should not be reduced to bad faith: geography made any alignment dangerous.
The mechanism is simple and unstable. A small state needs a patron, but picking one great power turns it into an enemy or proxy target for another. Zheng’s participation in returning 王子定 and its apparent Jin alignment help explain why Chu might later besiege Xinzheng.
《资治通鉴·周纪》07丨两起刺杀（2） adds a territorial consequence: 负黍 defects away from 郑国 back to Han, which the episode reads as evidence that Zheng’s position is weakening under interstate pressure.
Key Claims
- Buffer-state behavior can look opportunistic from outside while being structurally forced by geography.
- Alliance choice can solve one security problem while creating another.
- A small state’s internal instability can invite or magnify external pressure.
- Historical explanation should separate moral judgment of “betrayal” from the strategic constraints that make switching patrons likely.
Connections
- 郑国 - main source case.
- 晋国 and 楚国 - rival great-power poles.
- 韩国 - nearby target of Zheng’s opportunistic attack.
- 王子定 and Aristocratic Political Asylum / 贵族政治避难 - kinship-backed diplomatic thread.
- 负黍 and Territorial Control Churn / 城池反复易手 - territorial-control consequence added by part 2.