The Ukraine war , to my knowledge, for example, has not brought about an increased terrorist threat - so why should there an increased threat due to a conflict taking place thousands of miles away and started by a terrorist group themselves seizing hostages and carrying out a pogrom? And these hostages not even released yet to boot.
Talk about irony.
https://www.dailymail.co.uk/news/article-12909975/France-heightens-security-New-Years-Eve-high-terrorist-threat-blamed-war-Gaza-90-000-police-set-deployed.html