Final answer:
Stephen the Great's posture towards the Ottomans at the height of his career was defiance.
Step-by-step explanation:
At the height of his career, Stephen the Great's posture towards the Ottomans was defiance. Despite the constant threat of military conquest by the Ottomans, Stephen the Great led the Moldavian forces in numerous battles and successfully defended his kingdom against Ottoman invasions.
One notable example of Stephen the Great's defiance was the Battle of Vaslui in 1475, where his army achieved a decisive victory over the Ottoman forces led by Sultan Mehmed II. This victory was a major setback for the Ottomans and showcased Stephen's determination to protect his kingdom from Ottoman expansion.