wake-up call

That incident -- followed by a string of unexplained drone flights that rattled other European countries -- served as a wake-up call of the continent's vulnerabilities almost four years after Russia's full-scale invasion of Ukraine.

This was a wake-up call to Europe, marking one of the largest and most serious breaches of Nato airspace since the war in Ukraine began.

In early July, Morgan Stanley received its first wake-up call.

“That was a big wake-up call — we had 1 in 3 folks in 2020 be food insecure,” de la Haye said.

"Let no-one be mistaken: the theft of the crown jewels is a resounding wake-up call," said the court's president, Pierre Moscovici.