The war in Ukraine has been ongoing for five years.
75% confidence
Foreign AffairsUkraine
Omissions
The most common reference point for 'the war in Ukraine' is the full-scale Russian invasion of 24 February 2022, which by 16 September 2026 had lasted about 4 years and 7 months (i.e. it was in its fifth year) — 'five years' rounds this up slightly.
The conflict in eastern Ukraine (Donbas) and the annexation of Crimea began in 2014, meaning the war in Ukraine as a whole has lasted roughly 12 years by 2026; the speaker's 'five years' implicitly adopts the 2022 full-scale-invasion starting point.