ankara turkey summon german ambassador ankara saturday say kurdish militant rally cologne foreign ministry say sign strain relations nato ally condemn organization rally german city cologne extensions pkk terrorist organizations allow terror propaganda voice reaction strong manner germany ambassador ankara call ministry say state-run anadolu news agency say 3,000 kurdish supporters demonstrate cologne saturday carry posters call release abdullah ocalan jail leader kurdistan workers party pkk list terrorist group european union unite state ban germany turkey accuse germany enough stop pkk activities double standard approach germany follow regard global fight terrorism worry call germany show principled stance kinds terror ministry say relations europe particularly germany strain since president tayyip erdogan launch crackdown fail coup last year 50,000 people jail pending trial 150,000 people include journalists opposition figure sack suspend job germany criticize mass arrest refuse extradite people turkey say involve putsch attempt demand release around dozen german citizens arrest recent months turkey summon german envoy kurdish rally cologne