Ukrainian President Volodymyr Zelenskyy arrived today in Japan for diplomatic talks with the leaders of the world’s most powerful democracies as they tighten sanctions meant to punish Moscow over its 15-month invasion of Ukraine.

Bolstering international support is a key priority as Ukraine prepares for what’s seen as a major push to take back territory seized by Russia in the war that began in February last year. Zelenskyy’s in-person visit to the G7 summit comes just hours after the United States agreed to allow training on potent American-made fighter jets, laying the groundwork for their eventual transfer to Ukraine.

Italy's Prime Minister Giorgia Meloni (left), Canada's Prime Minister Justin Trudeau, France's President Emmanuel Macron, Japan's Prime Minister Fumio Kishida, US President Joe Biden, Germany's Chancellor Olaf Scholz and Britain's Prime Minister Rishi Sunak at the G7 summit. Photo / AP

Host nation Japan said Zelenskyy’s inclusion stems from his “strong wish” to participate in talks with the bloc and other countries that will influence his nation’s defense against Russia.

“Japan. G7. Important meetings with partners and friends of Ukraine. Security and enhanced cooperation for our victory. Peace will become closer today,” Zelenskyy tweeted upon his arrival on a plane provided by France.

An EU official, speaking on condition of anonymity to brief reporters on the deliberations, said Zelenskyy will take part in two separate sessions Sunday. The first session will be with G7 members only and will focus on the war in Ukraine. The second session will include the G7 as well as the other nations invited to take part in the summit, and will focus on “peace and stability”.

US national security adviser Jake Sullivan said President Joe Biden and Zelenskyy would have direct engagement at the summit. Yesterday, Biden announced his support for training Ukrainian pilots on US-made F-16 fighter jets, a precursor to eventually providing those aircraft to Ukraine’s Air Force.

Zelenskyy also met with Indian Prime Minister Narendra Modi, their first face-to-face talks since the war, and briefed him on Ukraine’s peace plan, which calls for the withdrawal of Russian troops from the country before any negotiations.

Russia’s deputy defense minister, Alexander Grushko, accused Western countries of “continuing along the path of escalation,” following the announcements that raised the possibility of sending F-16s to Kyiv.

The G7 vowed to intensify the pressure in its joint statement today.

“Russia’s brutal war of aggression represents a threat to the whole world in breach of fundamental norms, rules and principles of the international community. We reaffirm our unwavering support for Ukraine for as long as it takes to bring a comprehensive, just and lasting peace,” the group said.

World leaders have faced a balancing act at the G7 in Hiroshima as they look to address a raft of global worries demanding urgent attention, including climate change, AI, poverty and economic instability, nuclear proliferation and, above all, the war in Ukraine.

China, the world’s No 2 economy, sits at the nexus of many of those concerns.

Canada's Prime Minister Justin Trudeau (left) and France's President Emmanuel Macron. Photo / AP

There is increasing anxiety that Beijing, which has been steadily building up its nuclear weapons programme, could try to seize Taiwan by force, sparking a wider conflict. China claims the self-governing island as its own and regularly sends ships and warplanes near it.

The G7 on Saturday said they did not want to harm China and were seeking “constructive and stable relations” with Beijing, “recognising the importance of engaging candidly with and expressing our concerns directly to China.”

They also urged China to pressure Russia to end the war in Ukraine and “support a comprehensive, just and lasting peace.”

North Korea, which has been testing missiles at a torrid pace in an attempt to perfect a nuclear programme meant to target the mainland United States, must completely abandon its nuclear bomb ambitions, the leaders’ statement said, “including any further nuclear tests or launches that use ballistic missile technology. North Korea cannot and will never have the status of a nuclear-weapon state under” international nuclear treaties.

The green light on F-16 training is the latest shift by the Biden administration as it moves to arm Ukraine with more advanced and lethal weaponry, following earlier decisions to send rocket launcher systems and Abrams tanks. The United States has insisted that it is sending weapons to Ukraine to defend itself and has discouraged attacks by Ukraine into Russian territory.

Indian Prime Minister Narendra Modi (front left) sits opposite Japan's Prime Minister Fumio Kishida at their bilateral meeting. Photo / AP

“We’ve reached a moment where it is time to look down the road again to say what is Ukraine going to need as part of a future force, to be able to deter and defend against Russian aggression as we go forward,” Sullivan said.

The G7 leaders have rolled out a new wave of global sanctions on Moscow as well as plans to enhance the effectiveness of existing financial penalties meant to constrain President Vladimir Putin’s war effort. Russia is now the most-sanctioned country in the world, but there are questions about the effectiveness.

“Our support for Ukraine will not waver,” the G7 leaders said in a statement released after closed-door meetings. They vowed “to stand together against Russia’s illegal, unjustifiable and unprovoked war of aggression against Ukraine”.

“Russia started this war and can end this war,” they said.

Zelenskyy has consistently called for Western fighter jets to bolster his country’s defences. As Ukraine has improved its air defences with a host of Western-supplied anti-aircraft systems and prepares to launch a counteroffensive against Russia, officials believe the jets could become essential to the country’s long-term security.

Biden’s decisions on when, how many, and who will provide the fourth-generation F-16 fighter jets will be made in the months ahead while the training is under way, Biden told leaders.

Ukrainian President Volodymyr Zelenskyy arrives at Hiroshima Airport to attend the Group of Seven nations' meetings. Photo / AP

Japanese Prime Minister Fumio Kishida separately held talks today with Prime Minister Narendra Modi of India, which is hosting the gathering of G20 world leaders later this year. During their meeting, Kishida emphasised that attempts to change by force shouldn’t be tolerated anywhere in the world — a possible reference to Russia’s invasion of Ukraine and a warning to China over Taiwan.

India, the world’s largest democracy, has been measured in its comments on the war in Ukraine, and has avoided outright condemnation of Russia’s invasion. While India maintains close ties with the US and its Western allies, it is also a major buyer of Russian arms and oil.

The latest sanctions aimed at Russia include tighter restrictions on already-sanctioned people and firms involved in the war effort. More than 125 individuals and organisations across 20 countries have been hit with US sanctions.

In addition, new reporting requirements were issued for people and firms that have any interest in Russian Central Bank assets. The purpose is to “fully map holdings of Russia’s sovereign assets that will remain immobilised in G7 jurisdictions until Russia pays for the damage it has caused to Ukraine”, the US Treasury Department said.

The G7 nations said that they would work to keep Russia from using the international financial system to prosecute its war, and they urged other nations to stop providing Russia with support and weapons “or face severe costs”.

The leaders began the summit with a visit to a peace park dedicated to the tens of thousands who died in the world’s first wartime atomic bomb detonation. Kishida, who represents Hiroshima in parliament, wants nuclear disarmament to be a major focus of discussions.

Biden, who scrapped plans to travel on to Papua New Guinea and Australia after his stay in Japan so that he can get back to debt limit talks in Washington, arranged to meet today on the G7 sidelines with leaders of the so-called Quad partnership, made up of Japan, Australia, India and the United States.

Japan's Prime Minister Fumio Kishida (left), US President Joe Biden, Germany's Chancellor Olaf Scholz and Britain's Prime Minister Rishi Sunak participate in a family photo with G7 leaders. Photo / AP

The G7 leaders are also to discuss efforts to strengthen the global economy and address rising prices that are squeezing families and government budgets around the world, particularly in developing countries in Africa, Asia and Latin America.

A US official said the leaders would today issue a joint communique outlining new projects in the G7′s global infrastructure development initiative, which is meant to offer countries an alternative to China’s investment dollars.

The G7 includes Japan, the United States, the United Kingdom, France, Germany, Canada and Italy, as well as the European Union.