More now on those drone attacks reported in Kyiv.

Serhiy Popko, the head of Kyiv’s military administration, explained why raid alerts were announced several times in the Ukrainian capital.

“The enemy’s UAVs [unmanned aerial vehicles] were launched in many groups and attacked Kyiv in waves, from different directions, at the same time constantly changing the vectors of movement along the route,” he said, quoted by Reuters.

After a pause of 52 days, Moscow has resumed airstrikes on Kyiv. On Saturday, Ukrainian officials said all drones heading towards Kyiv were destroyed, but some hit infrastructure elsewhere in Ukraine.

Popko said on Sunday that according to preliminary information Ukraine’s air defence systems hit about 10 Iranian-made Shahed kamikaze drones in Kyiv and its outskirts.

Reuters could not independently verify the reports and there was no immediate comment from Russia.

Hello, this is the Guardian’s live coverage of the Russian war against Ukraine.

Russia launched several waves of drone attacks on Kyiv early on Sunday for the second night in row, stepping up its assaults on the Ukrainian capital after several weeks of pause, the city’s military administration said.

There were no initial reports of “critical damage” or casualties, said Serhiy Popko, the head of the Kyiv’s military administration, quoted by Reuters.

Here are some more developments:

• Ukraine’s president, Volodymyr Zelenskiy, has sanctioned 37 Russian groups and 108 people including a former prime minister and a former education minister and said he aimed to fight wartime abductions of children from Ukraine and other “Russian terror”.

• Ukrainian officials said on Saturday that its armed forces shot down 29 of 38 drones in an overnight raid. More than 400 towns and villages in the south, south-east and north of the country were affected by the drone attacks, including an oil refinery that was hit in Odesa.

• Ukrainian troops are working to push back Russian forces positioned on the east bank of the Dnipro River, the military has said, a day after Ukraine claimed to have secured bridgeheads on that side of the river that divides the country’s partially occupied Kherson region.

• Ukraine’s armed forces claimed to have killed a further 620 Russian soldiers on Friday during operations. In response, Russia has said it had heavily bombed Ukrainian forces near the Dnipro River and killed about 75 soldiers.

• Two Ukrainian emergency workers were killed in the Zaporizhzhia region by Russian rocket attacks on Saturday. Ukrainian police said seven people were also injured when Russia fired a series of rocket strikes at the village of Komyshuvakha, close to the frontline in the Zaporizhzhia region, which Russia claimed to have annexed last year.

• In an intelligence briefing, the UK’s Ministry of Defence noted Russian forces were suffering “particularly heavy casualties” in fighting around Avdiivka, one of three areas seeing heavy ground fighting. Despite the heavy fighting, the MoD said neither side was making significant progress.

• Hungary must say no to the current Europe model built in Brussels, the prime minister, Viktor Orbán, told a congress of his Fidesz party on Saturday, as his government continues to object to Ukraine joining the EU.

• The German chancellor, Olaf Scholz, has called on the Russian president, Vladimir Putin, to take the first step towards a peaceful resolution to the conflict in Ukraine by withdrawing troops.

• More than 100 Russian doctors have signed a joint letter calling on Putin to release a woman jailed for a supermarket protest against the war in Ukraine. A St Petersburg court last week sentenced Alexandra Skochilenko, 33, to seven years in prison for spreading “false information” after she swapped supermarket price tags with slogans criticising Russia’s offensive in Ukraine.

• Ukraine has been the target of nearly 4,000 cyber-attacks since the invasion began, three times higher than before, according to Ukrainian officials who oversee cyber defences.