The below quote definitely implies that countries will warn each other of lethal threats if they catch wind of them, which makes sense.
https://apnews.com/article/kerman-us...bc7b4868c8399c
Quote:
The official, who was not authorized to comment and insisted on anonymity to discuss the intelligence, said the U.S. was following its longstanding policy of a “duty to warn” other governments against potential lethal threats.
The official did not detail how the U.S., which does not have diplomatic relations with Iran, conveyed the warning about its intelligence on ISIS-Khorasan, known as ISIS-K, but noted that government officials “provide these warnings in part because we do not want to see innocent lives lost in terror attacks.”
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The ISIS attack in Iran was only a couple of months ago, which ended up killing nearly 100 people, and now yesterday's attack in Russia where the same group claims responsibility.