Pari gbolohun ti o tẹle: Koba ṣe ọpọlọpọ awọn ifarahan kariaye rẹ ni aarin ọdun 1990 fun Ukraine. O je oludije ife-eye idẹ ninu ere-ije 10,000 mita ni
1993 European Cup, biotilejepe yiyan rẹ fun iṣẹlẹ yẹn ni 1993 World Championships in Athletics ni a mu duro nitori ipalara. Ni 1994 o jẹ ọmọ ẹgbẹ ti ẹgbẹ orilẹ-ede fun Yokohama Women's Ekiden, 1994 IAAF World Cross Country Championships ati 1994 European Cross Country Championships (ti o wa ni kẹwa ni igbehin). O jẹ olori awọn ipo fun awọn obinrin Ukraine ni 1995 IAAF World Cross Country Championships ni ibi 60th ati gba idẹrun 5000 m ni 1995 European Cup. O ti yọkuro ni awọn ooru ni ifarahan nla kariaye rẹ kẹhin, ni 1995 World Championships in Athletics 5000 m race.