The Ukrainian leader made the comments in Paris at a joint news conference with the French leader. He said the two leaders had discussed joint production of drones and electronic warfare systems during talks.
"It's an ambitious, very substantive security agreement ... We can't talk openly about all the details," he told reporters.
Zelenskiy travelled to Paris on Friday evening after signing a separate bilateral deal on security arrangements with Germany.
Asked to compare the two deals, he said: "Each of the agreements strengthens Ukraine in its own way."
(Reporting by Yuliia Dysa; writing Tom Balmforth; Editing by Chris Reese)
