European governments have moved to their highest levels of alert for years following the attack last week on a concert hall in Moscow by militants from IS, which killed 140 people.
Within 48 hours, France increased its surveillance and risk warning to the highest level and Italy ordered enhanced measures. In Germany, officials described an "acute risk".
The attack in Moscow, the most lethal Islamist extremist operation in Europe, was claimed by IS, which officials believe has been planning new operations against European targets for several years.
Between 2015 and 2019, when IS ran a so-called caliphate across a swath of land it controlled across eastern Syria and western Iraq, the group's central leadership had little need of its newly established affiliates to launch operations in Europe as it had all resources to hand with foreign recruits, money and training camps.
This led to series of lethal attacks in France and Belgium.
However, years of counterterrorism operations by local security forces, the US and others, have degraded IS in its former strongholds and the group is fragmented and weak.
Western security officials with close knowledge of IS in Iraq and Syria said the group had abandoned its project of rebuilding the so-called caliphate but that successful strikes at international targets were seen as "good for morale and the IS brand and compensate for failure closer to home".
Recent US-led counter-terrorist operations have killed a series of IS leaders in Syria who were thought to have been planning terrorist attacks in Europe.
Analysts at the Washington Institute, a US-based thinktank, wrote: "[The US military's] decision to act against these individuals may indicate that the threat they posed needed to be dealt with immediately.
Esta historia es de la edición March 29, 2024 de The Guardian.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor ? Conectar
Esta historia es de la edición March 29, 2024 de The Guardian.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor? Conectar
FTX files $1.8bn lawsuit against Binance and its former CEO
The collapsed cryptocurrency company FTX is suing Binance and its former CEO Changpeng Zhao, alleging that $1.8bn was \"fraudulently transferred\" by FTX management to Binance and its executives.
Ref's video nasty Coote suspended for foul-mouthed Klopp tirade
The Premier League referee David Coote has been suspended after video footage emerged of him calling Jürgen Klopp a \"German cunt\" and Liverpool \"shit\".
Van Nistelrooy leaves United as Amorim checks in
Ruud van Nistelrooy has left his role as assistant coach after the arrival of Ruben Amorim at Manchester United.
Merino backs Arsenal to stay in title race after 'difficult few weeks'
Mikel Merino insists Arsenal will thrive on the pressure of their bid to win the Premier League and has cited the late push in Sunday's 1-1 draw at Chelsea as evidence of their character.
Robertson not worried after being 'written off' by some
Andy Robertson has said he had a point to prove in Liverpool's win over Aston Villa having been \"written off\" for the first time in his storied Anfield career.
Unfamiliar City woes make this Guardiola's trickiest challenge
The champions struggling in the autumn is nothing new but the root of this season's problems appear different
Coote's mindless rant undermines trust in referees - he can have no complaints over the consequences
There is lots I do not want to know about the video featuring the Premier League referee David Coote.
'Proud father' Gil Gomes reveals a unique family tale
Angel Gomes's dad recalls his own remarkable football journey which took him from Angola to Salford via Hendon
Foden and Palmer among eight England dropouts
Lee Carsley has been rocked by an extraordinary eight withdrawals from his England squad to face Greece and Republic of Ireland in the Nations League, Phil Foden an unexpected name on the absentees list where he joins his Manchester City teammate Jack Grealish.
Ruthless Ruud catches Alcaraz cold in Turin
Carlos Alcaraz made a stuttering start to the ATP Finals in Turin as he suffered a shock first career defeat to the world No 7 Casper Ruud.