Russia is putting the world at risk of famine through its blockade of Ukraine's shipments of grains and restrictions on its own exports, EU foreign policy chief Josep Borrell said on Saturday.

The threat to food security and a “battle of narrative” with Russia on Western-imposed sanctions on Moscow over Ukraine will dominate European Union foreign ministers' talks in Luxembourg on Monday.

"We are ready to work with the UN and our partners to prevent any unwanted impact on global food security," Borrell said in an article published on his official blog.

Read more: Ukraine's President Zelensky warns of global food crisis, urges end to Russian blockade

"Russia's conscious political choice is to 'weaponise'" grain exports and "use them as a tool for blackmail against anyone that opposes its aggression" in Ukraine, Borrell said.

"Russia turned the Black Sea into a warzone, blocking shipments of grain and fertiliser from Ukraine but also affecting Russian merchant shipping. Russia is also applying quotas and taxes on its grain exports," he added.

The sanctions imposed by the EU "do not prohibit Russia to export any agricultural goods, payment for such Russian exports or the provision of seeds, provided that sanctioned individuals or entities are not involved".

"We are fully aware that there is a 'battle of narratives' around this issue" of sanctions, Borrell continued. He added that it was imperative that Ukrainian exports be allowed to resume by ship.

"We are working closely with the UN on this issue and the EU and its member states are ready to do their part of the necessary actions to achieve this.

"We hope that a solution can be found in the coming days. Not doing this threatens to cause a global food catastrophe," he warned.