frankfurt tensions germany turkey hold plan defense project rheinmetall german company chief executive tell news agency dpa interview tie two nato ally strain turkish president tayyip erdogan crackdown opponents fail coup last year well germany refusal extradite people turkey say involve plot rheinmetall ceo armin papperger say interview publish monday several project include production ammunition fighter jet turkey upgrade turkey leopard tank still await decisions two governments relations turkey improve difficult obtain clearance germany say poor relations also dim rheinmetall prospect play role turkey altay tank project worth estimate billion euros 8.13 billion dpa say turkey bmc rheinmetall joint venture turkey among bidders first tranche build around 100 200 plan 1,000 combat tank dpa say bmc win contract rheinmetall could theory take part development tank via joint venture rbss german company hold 40 percent stake would need export clearance german government papperger say rheinmetall plan build tank factory turkey rheinmetall ceo say turkey row hold defense project dpa