The agriculture ministers of the Group of Seven nations have expressed serious concern about the impact of Russia's invasion of Ukraine on global food security.

The ministers issued a communique on Sunday as they wrapped up a two-day meeting in the southwestern Japanese city of Miyazaki.

The ministers said in the statement that they "continue to condemn in the strongest terms Russia's illegal, unprovoked and unjustified war of aggression against Ukraine."

They said they are "deeply concerned about the devastating impact the war is having on food security globally, not least through price spikes in grains, fuel and fertilisers."

They pledged to support Ukraine's recovery, including by helping demine agricultural land, reconstruction of agricultural infrastructure such as irrigation and warehouses destroyed by Russia, and supporting farmers' access to finance.

They stressed that the prolonged invasion and climate change have made resilient and sustainable food systems increasingly important. They called for promoting both domestic production and international trade to diversify supply chains of agricultural products. They also pledged efforts to enhance sustainable productivity.

The ministers also adopted an action plan to achieve sustainable agriculture. Called "Miyazaki Actions," the plan calls for a wide range of innovations in agriculture and intensified efforts to reform agriculture policies to reduce greenhouse gas emissions.

Japan's agriculture minister Nomura Tetsuro, who chaired the meeting, told reporters that the G7 ministers were able to send a unified message to achieve more productive agriculture.

He expressed hope to introduce the G7 communique and the action plan to other countries and gain their understanding.

Japan plans to have the adopted documents reflected in the discussions at the G7 summit in the western city of Hiroshima next month.