Factbox-Who is leading Russia's delegation at the Ukraine talks in Abu Dhabi?

Igor Kostyukov, Chief of the Main Directorate of the General Staff of the Russian Armed Forces, who is part of the Russian delegation in Istanbul for potential peace talks with Ukraine, exits the consulate general of the Russian Federation, in Istanbul, Turkey, May 15, 2025. REUTERS/Maxim Shemetov

MOSCOW, Jan 23 (Reuters) - Russian Admiral Igor ‌Kostyukov is set to head Moscow's team at trilateral security talks with the U.S. ‌and Ukraine on Friday in Abu Dhabi, as part of efforts to reach ‌a deal to end the war in Ukraine.

What do we know about Kostyukov?