Ukraine’s president has described the missile strike in Odesa as “barbarism”, adding Russia cannot be trusted to implement the landmark deal agreed to resume grain exports from Black Sea ports.

Less than 24 hours after the landmark agreement was signed by Ukraine and Russia, the port city of Odesa was hit by a missile strike.

Making his nightly address, Volodymyr Zelenskyy described the “cynical” attack as “barbarism”, adding it is a “blow to the political positions of Russia itself”.

“If anyone in the world could still say that some kind of dialogue with it, with Russia, some kind of agreements are needed, see what is happening,” he said.

“Today’s Russian Kalibr missiles have destroyed the very possibility for such statements. The occupiers can no longer deceive anyone.”

The president also addressed the attack during a meeting with US congressmen in Kyiv, telling them: “This proves only one thing: no matter what Russia says and promises, it will find ways not to implement it.”

The United Nations, European Union, US and UK all condemned the strikes on Saturday, with the UK’s prime ministerial hopeful Liz Truss describing the attack as “appalling”.

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While Moscow has not addressed or acknowledged the strikes, Turkey’s defence minister said Russian officials had told Ankara that Russia had “nothing to do” with the attack in Odesa.

Russia’s defence ministry did not reply to a Reuters request for comment.

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0:48

Sky’s Alex Rossi explains the significance of Russia and Ukraine’s deal to allow exports of grain from Black Sea ports

On Friday, delegates from Russia and Ukraine signed a deal which would allow grain exports to resume after they were blockaded by Vladimir Putin’s forces.

Representatives from both countries declined to sit at the same table and the display of the two countries’ flags were adjusted so that they were no longer next to one another.

The deal, which was also signed by the UN and Turkey at the ceremony in Istanbul, raises hopes that an international food crisis aggravated by the Russian invasion can be eased.

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2:40

Sky News correspondent Alistair Bunkall explains why Ukraine’s grain is stuck and why that matters

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UN Secretary-General Antonio Guterres called on Russia and Ukraine to fully implement the accord which opens the way to “significant volumes of commercial food exports” from three key Ukrainian ports – Odesa, Chornomorsk and Yuzhne.

The blockade by Russia’s Black Sea fleet since it invaded its neighbour has cut off supplies to markets around the world and sent grain prices soaring.