Photo taken on May 14, 2018 shows the stands of the NSC Olympic Stadium in Kiev, Ukraine. This stadium will host the UEFA Champions League final between Real Madrid and Liverpool on May 26. (Xinhua/Sergey)

Photo taken on May 14, 2018 shows the inside view of the NSC Olympic stadium in Kiev, Ukraine. This stadium will host the UEFA Champions League final between Real Madrid and Liverpool on May 26. (Xinhua/Sergey)

Constructors work in the NSC Olympic stadium in Kiev, Ukraine, on May 14, 2018. This stadium will host the UEFA Champions League final between Real Madrid and Liverpool on May 26. (Xinhua/Sergey)

Photo taken on May 14, 2018 shows the inside view of the NSC Olympic stadium in Kiev, Ukraine. This stadium will host the UEFA Champions League final between Real Madrid and Liverpool on May 26. (Xinhua/Sergey)

Fans take selfie in the NSC Olympic stadium in Kiev, Ukraine, on May 14, 2018. This stadium will host the UEFA Champions League final between Real Madrid and Liverpool on May 26. (Xinhua/Sergey)