The UK has unveiled a swathe of new sanctions against Russia, as Rishi Sunak arrived at the G7 summit in Japan with a self-declared mission to push India into showing greater support for Ukraine. Flying into Hiroshima for the three-day gathering of world leaders – and becoming the first British prime minister to visit the city destroyed by a US atomic bomb in 1945, Sunak announced a UK ban on imports of Russian diamonds and Russian-origin copper, nickel and aluminium, with other G7 members expected to follow suit. Seeking to push his credentials on the global stage after a bruising few weeks of domestic politics, Sunak also set out sanctions targeting another 86 individuals and firms linked to Vladimir Putin, taking the total UK sanctions list to over 1,500. Those newly sanctioned are described as being from the Russian president’s “military industrial complex”, as well as some who are involved in key economic areas including energy, metals and shipping. A key task for Sunak will be to put pressure on leaders who have maintained a more neutral stance over Russia’s invasion of Ukraine, notably the Indian prime minister, Narendra Modi. Before landing in Hiroshima along with his wife, Akshata Murty, her first attendance on an official No 10 trip, Sunak said he hoped to stress the extent of Russian war crimes to leaders from non-G7 nations including Modi and Luiz Inácio Lula da Silva, the Brazilian president. “One thing we have to keep doing is talking to countries like India and also Brazil. That is going to be in that second part of the summit which is a good thing,” Sunak said. “One of my three things is talking to countries around the world and making sure they realise what is going on, the war crimes Russia is committing inside Ukraine and why everyone should support bringing about a peaceful resolution to the conflict. “That’s what [Ukraine’s] President Zelenskiy wants, that’s what we want, and putting pressure on Russia to withdraw their forces so we can get to that outcome, that’s the consistent message that I will be taking to countries all around the world.” Sunak and Modi will meet, but it is not yet confirmed that this will be a formal bilateral meeting. Given the UK imposed punishing tariffs of 35% on diamonds and metals from Russia last year, massively reducing trade, the outright ban could prove largely symbolic unless it takes place in conjunction with other nations. The EU has has previously stopped short of banning diamonds owing to the importance of the sector to Antwerp in Belgium. It is expected to instead call for better tracing technology for Russian diamonds, a commodity that earned Russia €4.5bn (£3.9bn) in 2021. Iron, steel, gas, oil and coal imports to the UK from Russia are already banned. As well as discussing Ukraine, the assembled world leaders, among them the US president, Joe Biden, will hold talks on Indo-Pacific security in light of China’s threat to Taiwan, as well as nuclear disarmament, a key subject for Fumio Kishida, the Japanese prime minister, who is hosting the summit in the first city ever targeted by an atomic bomb. The leaders are expected to visit Hiroshima’s Peace Memorial Museum on Saturday. It details the destruction on 6 August 1945, which led to 140,000 deaths by the end of that year. In comments released before the summit, Sunak explicitly linked Hiroshima’s past with Russia’s actions in Ukraine. “For the sake of global peace and security, we must show that brutal violence and coercion does not reap rewards,” he said. “As today’s sanctions announcements demonstrate, the G7 remains unified in the face of the threat from Russia and steadfast in our support for Ukraine. We are meeting today in Hiroshima, a city that exemplifies both the horrors of war and the dividends of peace.” The summit, which follows Sunak’s address to the Council of Europe summit in Reykjavik, is a chance for the prime minister to look beyond domestic woes following the Conservatives’ terrible results in this month’s local elections, in which the party exceeded even its deliberately gloomy pre-poll forecast of 1,000 losses. Even heading to the G7, however, he has not been immune, facing criticism for being out of touch after telling reporters on the flight to Japan that people’s household incomes were “hugely outperforming” expectations and there were “lots of signs that things are moving in the right direction” with the economy. Sunak met Kishida for dinner on Thursday night after signing a defence pact agreeing to consult each other on major military decisions. The summit is set to discuss the Chinese threat towards Taiwan, amid increasing belligerence from Beijing since the invasion of Ukraine. The prime minister also held a business reception for UK and Japanese companies, with Sunak claiming about £18bn of investment had been pledged.