BERLIN (Reuters) - German and French officials on Thursday signed four documents that they said underscored their determination to work together to jointly develop new weapons systems, including a maritime airborne warfare aircraft and a new fighter jet.German Defense Minister Ursula von der Leyen and her French counterpart Florence Parly both described the move as historic.Von der Leyen underscored that other European countries could still join the project to develop a new combat aircraft.Reporting by Andrea Shalal; Editing by Michelle Martin Disclaimer: The views expressed in this article are those of the author and may not reflect those of Kitco Metals Inc. The author has made every effort to ensure accuracy of information provided; however, neither Kitco Metals Inc. nor the author can guarantee such accuracy. This article is strictly for informational purposes only. It is not a solicitation to make any exchange in commodities, securities or other financial instruments. Kitco Metals Inc. and the author of this article do not accept culpability for losses and/ or damages arising from the use of this publication.