KYIV, Nov 29 - The incident which took place in the Kerch Strait on November 25 closes all political discussion about whether Kyiv should denounce its 2003 agreement with Russia on cooperation in the use of the Sea of Azov and the strait, Yevhen Marchuk, Ukraine's representative in the Trilateral Contact Group (TCG) which mediates the Donbas conflict, said.

"Today I don't even see a subject matter for discussion: to denounce or not to denounce the 2003 agreement with Russia on the joint use of the Sea of Azov and the Kerch Strait... Russia crossed out this agreement, and the one on [joint] national border," Marchuk said at a panel discussion during the second international maritime security conference in Kyiv on Thursday.