US think tank says Ukrainian forces have ‘likely won the battle of Kharkiv’; electricity supplier RAO Nordic says decision to suspend Finnish supply is ‘exceptional’

• First Russian soldier goes on trial in Ukraine for war crimes
• Ukraine has repelled Russia attempt to cross Donbas, UK confirms
• The Ukrainian who walked 225km to safety from Mariupol
• ‘They were furious’: the Russian soldiers refusing to fight
• Russia-Ukraine war: what we know on day 80 of the invasion

Here are some of the latest images we have been sent over the newswires showing the impact of the conflict in Ukraine and beyond.

British foreign secretary Liz Truss said it was vital to keep up the pressure on Russia by supplying more weapons to Ukraine and imposing further sanctions.

Vadim Shysimarin accused of killing civilian on 28 February while fighting in Sumy region in north-east Ukraine

The first war crime trial since Vladimir Putin ordered the invasion of Ukraine has opened in Kyiv in a watershed moment.

Vadim Shysimarin, a 21-year-old Russian commander of the Kantemirovskaya tank division, allegedly killed a civilian on 28 February in the village of Chupakhivka while fighting in the Sumy region in north-east Ukraine.

Troops are saying no to officers, knowing that punishment is light while Russia is not technically at war

When the soldiers of an elite Russian army brigade were told in early April to prepare for a second deployment to Ukraine, fear broke out among the ranks.

The unit, stationed in Russia’s far east during peacetime, first entered Ukraine from Belarus when the war started at the end of February and saw bitter combat with Ukrainian forces.

UN verifies nearly 100 child killings but says figure likely higher; Ukraine’s EU application to be assessed in June, says France

• Finland ‘must apply to join Nato without delay’
• G7 to discuss action to break blockade of Ukraine grain imports
• Why are Sweden and Finland not in Nato?
• At a glance: what we know on day 78 of the invasion

The UK Prime Minister Boris Johnson has reiterated his government’s position that there can be no renormalisation of relationships with Russian President Vladimir Putin. Reuters reports that asked on LBC radio whether Putin could be welcomed back on the global stage if he were to repent, Johnson said: “The short answer is no. No renormalisation and the UK is very clear about that.”

Overnight the Ukrainian defence ministry published photos of what it said were destroyed Russian tanks and other equipment in the village of Bilohorivka, that had been struck when the Russians were attempting to construct a pontoon-bridge over the Siverskyi Donets river. The general staff of the Ukraine armed forces published the pictures again this morning on Facebook.

UK signs security assurance declarations with Sweden and Finland; Ukraine leader says discovery of atrocities makes peace negotiations harder

• UK pledges to back Sweden and Finland against Russian threats
• Ukraine ready to launch first war crimes trials of conflict
• Ukraine refugees who enter UK via Ireland may be sent to Rwanda
• Russian invasion in east reaching stalemate, says US
• In pictures: inside the Azovstal steelworks
• What we know on day 77 of the invasion

Two points of note from the operational update of the general staff of Ukraine’s armed forces this morning. They claimed:

In the Donetsk and Luhansk oblast, defenders of Ukraine repulsed 12 enemy attacks, destroyed 12 tanks, four artillery systems, 19 units of armoured combat vehicles, seven cars and two units of special engineering equipment of the enemy.

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.

This blog has now closed. You can find our latest coverage of the Russia-Ukraine war in our new live blog

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.