A credible European deterrent – one that could prevent, for instance, a rapid Russian incursion in the Baltics – would need a minimum of 1,400 tanks, 2,000 infantry fighting vehicles, and 700 artillery pieces. This is more combat power than currently exists in the combined French, German, Italian, and British land forces.
The original source:
https://www.bruegel.org/analysis/defending-europe-without-us-first-estimates-what-needed
The context is about member states matching the lost military power from the US, without implementing an EU army.