Thanks for the 8 sources of these 3 related stories :

From Germany you had 3 more sources which were :
Russian spring offensive could lead to war with Nato, according to German defence scenario https://www.intellinews.com/russia-could-attack-nato-as-early-as-february-bild-reports-307785/

Germany warns of Russian attack on NATO within ‘5-8 years’ https://www.aa.com.tr/en/europe/germany-warns-of-russian-attack-on-nato-within-5-8-years-/3113783

Leaked German military documents laid out a doomsday scenario where Russia wins in Ukraine then invades Europe
https://www.businessinsider.com/leaked-military-docs-envision-russia-war-nato-in-2024-2024-1

2 from Poland :
‘Europe will be subject to a direct Russian attack in the next few years’ — Polish PM Tusk https://news.yahoo.com/europe-subject-direct-russian-attack-150500271.html

Polish PM warns of possible Russian aggression against Europe https://newsukraine.rbc.ua/news/polish-pm-warns-of-possible-russian-aggression-1704315471.html

and 2 from Estonia:
Europe has 3-5 years to prepare for threat from Russia’s side - Estonian PM https://www.pravda.com.ua/eng/news/2024/01/15/7437368/

Russia’s attack on NATO - Kaja Kallas says there is 3-5 years to prepare and calls for stopping Putin in Ukraine
https://eng.obozrevatel.com/section-world/news-there-are-3-5-years-to-prepare-estonian-prime-minister-warned-of-possible-russian-aggression-against-nato-16-01-2024.html

Edits : added the one i missed. 2nd ed: corrected source.