Question: Which country is involved in an international dispute with a sovereign state of Eastern Europe which is home to the professional and international football defender Sakhnyuk who was born in 1987, played in the nations premier league and in their national under 21 team?
Sentence (from "Sport in Mauritania"): The nation's best-known and most successful team is ASC Garde Nationale of the Mauritanian Premier League.
Relevant evidence: No