ASHINGTON -- Ukraine’s foreign minister is describing the situation in Mariupol as dire and heartbreaking and says Russia’s continued attacks there could be a “red line” that ends all efforts to reach peace through negotiation.

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Dmytro Kuleba tells CBS’ “Face the Nation” that the remaining Ukrainian military personnel and civilians in the port city are basically encircled by Russian forces.

He says the Ukrainians “continue their struggle” but that the city effectively doesn’t exist anymore because of massive destruction.

Kuleba says his country has been keeping up “expert level” talks with Russia in recent weeks in hopes of reaching a political solution for peace.

But citing the significance of Mariupol, he echoed Ukrainian President Volodymyr Zelenskyy in saying the elimination of Ukrainian forces there could be a “red line” that stops peace efforts.

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