German Defense Minister Boris Pistorius arrived in Kyiv on an unannounced visit on Monday to discuss expanding defense-industrial cooperation and joint weapons production with Ukraine, according to German N-TV outlet.  The trip was kept secret ahead of time for security reasons. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . Speaking upon the arrival, Pistorius said Berlin and Kyiv are preparing new joint arms development projects, including advanced drone