Volodymyr Zelenskiy vows to defend Ukrainian citizens after Moscow-backed officials declare victory in regional ‘referendums’ on joining Russia

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President Volodymyr Zelenskiy has said Ukraine will “defend” its citizens in Moscow-held regions that authorities have claimed voted in favour of merging with Russia. Zelenskiy said in a video on Telegram: “We will act to protect our people, both in the Kherson region, in the Zaporizhzhia region, in the Donbas, in the currently occupied areas of the Kharkiv region, and in the Crimea.” Agence France-Presse reported that Kremlin-backed officials in the four Ukrainian regions holding “referendums” claimed victory on Tuesday amid international condemnation of sham ballots.

Poland’s foreign minister, Zbigniew Rau, has said Nato’s response to any use of nuclear weapons in Ukraine should be non-nuclear but “devastating”. His comments come after Dmitry Medvedev, the hawkish deputy chairman of Russia’s security council, again threatened the west with the use of nuclear weapons in Ukraine, saying: “Imagine that Russia is forced to use the most formidable weapon against the Ukrainian regime, which has committed a large-scale act of aggression, which is dangerous for the very existence of our state. I believe that Nato will not directly intervene in the conflict, even in this situation.”

European leaders have said sabotage is the most likely cause of leaks in two Nord Stream gas pipelines between Russia and Europe, after seismologists reported explosions around the Baltic Sea lines. Denmark’s military issued an image of gas bubbling at the surface of the Baltic after the “unprecedented” damage to the pipelines.

The European Commission president, Ursula Von der Leyen, threatened the “strongest possible response” to any deliberate disruption of European energy infrastructure in the wake of the Nord Stream damage. Swedish police said they had launched a preliminary investigation into possible sabotage. Poland’s prime minister, Mateusz Morawiecki, has called the leaks “an act of sabotage” that “related to the next step of escalation of the situation in Ukraine”.

President Vladimir Putin is scheduled to address both houses of the Russian parliament on Friday and may use the address to formally announce the accession into Russia of the Ukraine territories that held referendums, the British Ministry of Defence said in its latest intelligence update. Putin said on Tuesday that Russia wanted to “save people” in the territories.

The US secretary of state, Antony Blinken, said the west would never recognise Russia’s annexation of Ukrainian territory, which he called part of a “diabolical scheme” by Moscow. Nato denounced the referendums as a “sham” and “violation of international law”.

The United Nations human rights office has said Russia’s invasion of Ukraine led to a wide range of human rights violations – including extrajudicial killings and torture – that could amount to war crimes, and had caused a dire rights situation. The Office of the High Commissioner for Human Rights said in a report that it was particularly concerned about torture and ill treatment of detainees by Russian forces and affiliated armed groups, but that there had been rights violations by both sides.

Georgia and Kazakhstan said that tens of thousands of Russians had flooded into their countries from neighbouring Russia as military-aged men avoid military call-up following Vladimir Putin’s mobilisation.

Moscow said it would not request the extradition of Russians travelling abroad to avoid being called-up to fight in Ukraine.

Untrained conscripts being sent directly to Ukraine frontline, Kyiv claims; UK announces new package of sanctions. This live blog has now closed

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Alex Rossi is the Sky News correspondent in Moscow. He has offered this analysis this morning, saying:

We’re now five days into this [mobilisation]. It doesn’t seem to really have gone down very well. Bear in mind that Russia, of course, is a very heavily securitised police state where dissent isn’t tolerated, but there have been sporadic protests all over the country.

The number of people that they’re trying to draft is 300,000. That’s almost double the initial invasion force. So it is a reflection of how badly things are going on the battlefield for the Kremlin, and just shows that they have a very significant manpower problem.

Arrests made in 32 cities at rallies against mobilisation; border crossings from Russia to Finland have doubled and 10km queue reported at frontier with Georgia. This blog is now closed

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Russian forces launched new strikes on Saturday, targeting infrastructure facilities, Zaporizhzhia city’s administrative head, Oleksandr Starukh, said via his Telegram channel.

One missile hit an apartment building causing a fire, killing one person and injuring seven others.

But if you get into the Russian army, sabotage any activity of the enemy, hinder any Russian operations, provide us with any important information about the occupiers – their bases, headquarters, warehouses with ammunition. And at the first opportunity, switch to our positions.

Western officials say true target could be higher but significant hurdles remain to mobilise stated target of 300,000

The British Ministry of Defence has giving its latest intelligence update on how it sees the situation on the ground in the war. It says that “the battle situation remains complex” but that “Ukraine is now putting pressure on territory that Russia considers essential to its war aims”, with fighting along the Oskil River, and a Ukrainian assault on the town of Lyman, Donetsk, which Russia captured in May.

This is Martin Belam in London with the live blog now for the next few hours. You can reach me at martin.belam@theguardian.com