International athletics – Sergey Bubka's nationality Sergey (Serhiy) Bubka, the legendary world-record pole vaulter, belongs to which country (as recognized in his international representation after the Soviet era)?

Introduction / Context:
Sergey Bubka is synonymous with pole vault excellence, having set and reset world records multiple times. Identifying his nationality strengthens general sports awareness, especially around athletes who spanned the Soviet and post-Soviet eras.

Given Data / Assumptions:

• The athlete is the iconic Bubka of men's pole vault.
• We consider his nationality in international representation following the dissolution of the USSR.
• We focus on commonly accepted references in athletics records.

Concept / Approach:
Bubka initially competed for the Soviet Union; after its dissolution he represented Ukraine. His administrative roles later also tied him closely to Ukrainian and international athletics governance.

Step-by-Step Solution:

Verification / Alternative check:
World Athletics profiles and Olympic records list Bubka under Ukraine in the 1990s, corroborating the answer.

Why Other Options Are Wrong:

• Russia / U.S.A / Brazil: Not the national affiliation of Bubka in international competition after the Soviet period.

Common Pitfalls:
Assuming Soviet-era dominance means Russian nationality, or confusing training bases with nationality.

Final Answer:
Ukraine