Norway has promised Ukraine six US-made F-16s to help it fend off Russia's invasion, with deliveries spread out across 2024 and 2025.

France has meanwhile said it would provide an unspecified number of French-made Mirage 2000-5s during the first quarter of 2025.

"The timetable I gave is being met," said French Defence Minister Sebastien Lecornu, declining to comment on reports that three aircraft were to be delivered by January 20.

"The delivery of jet fighters to a country at war is, by definition, sensitive... What has been promised will be delivered," he said.

His Norwegian counterpart Bjorn Arild Gram meanwhile confirmed that Norway's "first batch" of F-16s had been delivered, but refused to disclose any "operational details".

"We are on schedule," he said.

The two ministers also signed a letter of intent aimed at bolstering their military cooperation, notably regarding the protection of underwater infrastructure, amid the threat of so-called hybrid warfare posed by Russia.

The French navy has placed an order with Norway's Kongsberg Maritime for the Hugin seabed exploration vehicle, capable of diving to a depth of 6,000 metres (20,000 feet).

Competing in a tender with the United States, Britain and Germany, France also hopes to sell five so-called defence and intervention frigates to Norway.

Gram confirmed that Oslo would announce its choice "this year".