The German company expects to sign contracts for two more joint ventures in the coming days, for ammunition and air defence, according to Handelsblatt.
"Ukraine will benefit from a comprehensive technology transfer as well as a short-term supply of military equipment from Germany," Papperger told Handelsblatt.
The newspaper cited the head of Ukroboronprom, Yuriy
Husyev, as welcoming Rheinmetall's willingness to support
Ukraine in its fight against Russia.
Rheinmetall has ridden a rise in defence spending since
Russia's invasion of Ukraine last year, with Germany also
supplying aid and weapons to Kyiv to help repel Russian forces.
Rheinmetall makes ammunition, other military equipment and also the Leopard tanks that Germany decided to send to Ukraine, which the company produces jointly with Krauss-Maffei Wegmann.
The company did not immediately provide comment.
(Writing by Miranda Murray; editing by Matthias Williams)