The parties involved should exercise (self -) restraint and prevent the situation from getting worse.

有关各方应采取克制态度，防止事态扩大。

《新英汉大辞典》

A moral grown-up is someone who can exercise restraint and acknowledge they don't need a new car every year, or two holidays a year.

道德成长是一个人克制并且清楚他不是每年都需要一个新的汽车或是一年之中两个假期。

youdao

We need to exercise restraint.

我们需要学会约束。

youdao

U.N.officials described it as a very serious incident and urged both sides to exercise caution and restraint.

VOA: standard.2009.09.11

and we are still urging both parties to exercise maximum restraint."

VOA: standard.2010.08.03

"In lieu of the LTTE releasing people the U.N.Secretary General has called upon the government of Sri Lanka to exercise maximum restraint as it carries the fight to the LTTE in order to protect civilian lives,".

VOA: standard.2009.05.11

"I want to appeal to the nation to remain peaceful and exercise restraint, " he said.

NPR: Pakistan's Bhutto Killed in Suicide Bomb Attack

Clinton asked that India "continue to exercise restraint, " and settle the Kargil crisis bilaterally through direct talks.

CNN: THE DANGER OF ESCALATION

But for the judiciary to earn--and sustain--that pre-eminence, it needs to exercise restraint.

CNN: Our Imperial Judiciary