形势紧张 英语怎么说？

a tight situation
escalating tension

the status of affairs is tension~

situation is stress between （国家）and（国家）

the situation is very tense

tense situation / atmosphere

situation is getting tensed up

the situation is tensing up

供参考：
tense
adjective
1. strained, uneasy, stressful, fraught, charged, difficult, worrying, exciting, uncomfortable, knife-edge, nail-biting, nerve-racking the tense atmosphere of the talks
2. nervous, wound up (informal), edgy, strained, wired (slang), anxious, under pressure, restless, apprehensive, jittery (informal), uptight (informal), on edge, jumpy, twitchy (informal), overwrought, strung up (informal), on tenterhooks, fidgety, keyed up, antsy (informal), wrought up