Firefighters work at a site of a Russian missile strike in a sea port of Odesa on Saturday. Reuters

Ukraine pressed ahead on Sunday with efforts to restart grain exports from its Black Sea ports under a deal aimed at easing global food shortages but warned deliveries would suffer if a Russian missile strike on Odesa was a sign of more to come.

President Volodymyr Zelensky denounced Saturday's attack as "barbarism" that showed Moscow could not be trusted to implement a deal struck just one day earlier with Turkish and United Nations mediation.

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The Ukrainian military, quoted by public broadcaster Suspilne, said the Russian missiles did not hit the port's grain storage area or cause significant damage. Kyiv said preparations to resume grain shipments were ongoing.

"We continue technical preparations for the launch of exports of agricultural products from our ports," Infrastructure Minister Oleksandr Kubrakov said in a Facebook post.

Firefighters put out a fire in a port after a Russian missiles attack in Odesa, Ukraine, on Saturday. AP

Meanwhile, Russia said its missile barrage on a Ukrainian port central to a landmark grain export deal had destroyed Western-supplied weapons, after the attack sparked an outcry from Ukraine's allies.

Russian Foreign Minister Sergei Lavrov was embarking on a tour of several countries in Africa and on his first stop in Egypt Sunday sought to reassure Cairo that Russian grain supplies would continue.

According to the Ukrainian military, two Kalibr missiles fired from Russian warships hit the area of a pumping station at the port and two others were shot down by air defence forces.

Russia said on Sunday its forces had hit a Ukrainian warship and a weapons store in Odesa with its high-precision missiles.

An employee operates a combine as he harvests wheat in a field in Kharkiv region, Ukraine. File/Reuters

Turkey helped broker the accord and said immediately after the double cruise missile hits that it had received assurances from Moscow that Russian forces were not responsible.

But Russia's defence ministry rolled back on the denial Sunday, saying the strikes had destroyed a Ukrainian military vessel and arms delivered by Washington.

"High-precision, long-range missiles launched from the sea destroyed a docked Ukrainian warship and a stockpile of anti-ship missiles delivered by the United States to the Kyiv regime," it said.

"A Ukrainian army repair and upgrade plant has also been put out of order."

The strikes have cast a shadow over the milestone accord — that was hammered out over months of negotiations and signed in Istanbul — to relieve a global food crisis.