Concern after Russian missiles struck the Black Sea port on Monday as Biden accuses Putin of ‘revisionist history’ in his Victory Day speech

• Russia-Ukraine war: latest updates

Ukraine’s president, Volodymyr Zelenskiy, has urged the international community to take immediate steps to end a Russian blockade of his country’s ports in order to allow wheat shipments and prevent a global food crisis.

The Black Sea export port of Odesa was struck by missiles on Monday. Zelenskiy said: “For the first time in decades there is no usual movement of the merchant fleet, no usual port functioning in Odesa. Probably this has never happened in Odesa since world war two.

The United States cited “anecdotal reports” that some Russian troops in Ukraine were not obeying orders. “Mid-grade officers at various levels, even up to the battalion level” were refusing to move forward in the Donbas offensive.

The UN human rights council is due to hold a special session on Thursday to address alleged Russian human rights violations during its war in Ukraine. More than 50 countries, including Britain, Germany, Turkey and the US, backed a request by Ukraine and demanded an extraordinary meeting of the UN’s top rights body.

A mine-sniffing dog credited with detecting more than 200 explosives since the start of the war in Ukraine has been given a medal. Patron, a two-and-a-half-year-old jack russell whose name means “ammo” in Ukrainian, was presented with the award by Ukraine’s president, Volodymyr Zelenskiy, in Kyiv.

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As Vladimir Putin wages a bloody and unrelenting war in Ukraine, Guardian foreign correspondent Luke Harding has examined Putin’s unlikely path to the Russian presidency.

From his humble beginnings in St Petersburg to his mysterious and “mediocre” career in the KGB, in this video report we chronicle how Putin deftly manoeuvred himself to become one of the most powerful autocrats in modern history:

Chinese exports to Russia fell in April for the second month as China’s northern neighbour grappled with economic sanctions, while Russian shipments to China surged, a balm to hard-hit Russian firms facing international economic isolation.

Shipments to Russia fell 25.9% in April from a year earlier in dollar terms, worsening from a 7.7% decline the previous month, according to Reuters calculations based on customs data on Monday.

Two thousand Ukrainian troops thought to be trapped inside steelworks after civilian evacuation

• Russia-Ukraine war: latest updates

Members of Ukraine’s Azov battalion trapped inside Mariupol’s Azovstal steel plant have said they fear they will be killed if captured by Russian forces, as they pleaded with Ukrainian authorities to help arrange their extraction.

Speaking to the media from inside the besieged steelworks, an Azov commander and lieutenant, looking gaunt and pale, said they had defended the city for the people of Ukraine and the rest of the world and needed a third party to negotiate their exit whether by land or sea.

Rescue attempts impossible due to constant shelling in Bilohorivka, says Luhansk governor

• Russia-Ukraine war – latest updates

Sixty people are feared to have been killed after a village school in eastern Ukraine took a direct hit in a Russian air raid, with rescue attempts said by the regional governor to be impossible due to constant shelling.

Russian attacks in the east and south intensified at the weekend ahead of Monday’s symbolic Victory Day celebrations, with the Black Sea city of Odesa coming under repeated missile strikes and the remaining Ukrainian fighters in the Azovstal steelworks in the besieged port city of Mariupol staging a press conference on Sunday saying they had been “abandoned” by the government as Russian attacks continued