Ukraine’s President Volodymyr Zelensky is expected to call on G7 leaders to do more to support his country’s fight against Russia.
Mr Zelenskyy will address world leaders, including Boris Johnson and Joe Biden, via a video link from Kyiv after he urged allies to be “partners and not observers” in his Sunday night speech.
Meanwhile, Johnson will use Monday’s session in Germany to call for urgent action to help pull the grain supply out of Ukraine, with countries around the world suffering from shortages.
Since the fighting began, major Ukrainian ports, including Odessa, have been blocked and there have been attacks on farms and warehouses.
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Before the war, 10% of the world’s wheat, almost 18% of the world’s corn and half of the world’s sunflowers were supplied by Ukraine.
But some 25 million tonnes of maize and wheat are currently at risk of rotting in silos and food prices have risen globally since the war began.
Some 47 million people worldwide in countries that depend on Ukrainian exports are at risk of humanitarian disaster.
On Sunday, missile attacks continued to rain on Ukrainian cities, including Kyiv, and Johnson warned that the country was “on the brink of a knife.”
Johnson is expected to call for an international solution to the crisis, including the search for land routes for grain exports.
The United Kingdom has urged Turkey, which controls access to the Black Sea, to do more to bring grain supplies by ship.
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2:33 G7 leaders meet, rockets hit Kyiv
Only Putin can end the war
Johnson will tell G7 leaders later: “Putin’s actions in Ukraine are creating terrible aftershocks around the world, driving up energy and food prices as millions of people are on the brink of starvation.
“Only Putin can end this unnecessary and useless war.
“But world leaders must unite and apply their combined economic and political weight to help Ukraine and make life easier for households around the world. Nothing should be off the table.”
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2:09 Climate protests hold G7 summit
The prime minister also wants G7 leaders to consider the use of grain as a source of biofuel, saying its use to power vehicles may be reducing availability.
The UK will also invest £ 1.5 million in developing a testing process to identify whether cereal sold by Russia has been illegally introduced from Ukraine.
Last week, at the Commonwealth Heads of Government meeting, Johnson announced an additional £ 372 million for the countries most affected by rising world food prices.
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1:07 G7 leaders pose for family photo
Zelenskyy will address both the G7 and NATO summits in the coming days.
Ahead of his speech to G7 leaders meeting in the Bavarian Alps, the Ukrainian president said he would demand additional defense systems to combat missile bombing.
“We need a powerful air defense – modern, fully effective – that guarantees complete protection against these missiles,” he said.
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0:52 Spouses of G7 leaders walk
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“We talk about it every day with our partners. There are already some agreements. And the partners need to move faster if they really are partners, not observers.
“Delays in the transfer of weapons to our state, any restrictions are actually an invitation to Russia to attack again and again.
“The occupiers – these terrorists – have to be beaten with all our might so that they don’t think they can pressure and outdo someone.”