TOKYO (AP) — President Joe Biden told fellow Indo-Pacific leaders assembled for a four-country summit Tuesday that they were navigating “a dark hour in our shared history” due to Russia’s brutal war on Ukraine and he urged the group to make a greater effort to stop Vladimir Putin’s aggression.

“This is more than just a European issue. It’s a global issue,” Biden said as the “Quad” summit with Japan, Australia and India got under way.

While the president did not directly call out any countries, his message appeared to be pointed, at least in part, at Indian Prime Minister Narendra Modi, with whom differences persist over how to respond to the Russian invasion.

Unlike other Quad countries and nearly every other U.S. ally, India has not imposed sanctions or even condemned Russia, its biggest supplier of military hardware.

With Modi sitting nearby, Biden made the case that the world has a shared responsibility to do something to assist Ukrainian resistance against Russia’s aggression.

“We’re navigating a dark hour in our shared history,” he said. “The Russian brutal and unprovoked war against Ukraine has triggered a humanitarian catastrophe and innocent civilians have been killed in the streets and millions of refugees are internally displaced as well as in exile.”

“The world has to deal with it, and we are,” he added.

For several of the bigger Asian powers, the invasion has been seen as a crucial moment for the world to demonstrate by a strong response to Russia that China should not try to seize contested territory through military action.

Japanese Prime Minister Fumio Kishida, taking note of Russia’s aggression in Ukraine, told the other leaders: “We cannot let the same thing happen in the Indo-Pacific region.”

A reminder of tensions in the region came during Biden’s trip. Chinese and Russian strategic bombers conducted joint flights around Japan on Tuesday.

Japanese Defense Minister Nobuo Kishi described the exercise as a “threat” and “an increased level of provocation,” and said the cooperation between China and Russia was “concerning and unacceptable.”

The White House has been effusive in its praise of several Pacific countries, including Japan, Singapore and South Korea, for stepping up to hit Russia with tough sanctions and export bans while offering humanitarian and military assistance to Kyiv.

However, the White House has been disappointed with the relative silence of India, the world’s biggest democracy.

After a one-on-one meeting with Modi in Japan, Biden said they discussed Russia’s invasion of Ukraine “and the effect it has on the entire global world order.” Biden added that the U.S. and India will continue to consult “on how to mitigate these negative effects.”

But in a reflection of India’s relationship with Moscow, the Quad leaders’ post-summit joint statement made no mention of Russia.

In his comments, Modi did not refer to the war in Ukraine, instead ticking off several trade and investment programs that he discussed with the president.

Biden has asked Modi not to accelerate the buying of Russian oil as the U.S. and other allies look to squeeze Moscow’s energy income. The Indian prime minister made no public commitment to get off from Russian oil, and Biden has publicly referred to India as “somewhat shaky” in its response to the invasion.

Facing Western pressure, India has condemned civilian deaths in Ukraine and called for an immediate cessation of hostilities. Yet it also has compounded fallout from a war that has caused a global food shortage by banning wheat exports at a time when starvation is a growing risk in parts of the world. The Indian prime minister did not address Russia’s war against Ukraine in his public remarks at the summit.

Biden has been making his case to Modi for weeks.

The two spoke about the Russian invasion during a virtual Quad leaders’ meeting in March, and last month they had a short video conversation when Secretary of State Antony Blinken and Defense Secretary Lloyd Austin met with their Indian counterparts in Washington.

“So it won’t be a new conversation,” White House national security adviser Jake Sullivan said ahead of the summit. “It will be a continuation of the conversation they’ve already had about how we see the picture in Ukraine and the impacts of Russia’s brutal invasion of Ukraine on a wider set of concerns in the world.”

While Biden and Modi may avoid public confrontation over how to respond to Russia’s aggression, the issue remains a major one as the U.S. and allies are looking to tighten the pressure on Putin., said Michael Green, senior vice president for Asia at the Center for Strategic and International Studies in Washington.

“It appears pretty clear the Biden administration is not looking for trouble with India and that most of these difficult conversations will be in private,” said Green, who was a senior National Security Council aide during the George W. Bush administration.

The summit came on the final day of Biden’s five-day visit to Japan and South Korea, Biden’s first trip to Asia as president.

It also marked new Australian Prime Minister Anthony Albanese’s first moment on the global stage. The new premier flew to Tokyo on Monday right after being sworn into office. The center-left Labor Party defeated Prime Minister Scott Morrison over the weekend, ending the conservative leader’s nine-year rule

Biden, Modi and Kishida welcomed Albanese to the club and expressed awe at his determination to join the informal security coalition so quickly after assuming office.

“I don’t know how you’re doing it,” Biden, who looked a bit worn from his own travel, told Albanese. The U.S. president joked that it would be OK if the new prime minister happened to fall sleep during the meeting.

Biden was to meet separately with Albanes later Tuesday. The four-way partnership has become increasingly relevant as Biden has moved to adjust U.S. foreign policy to put greater focus on the region and to counter China’s rise as an economic and security power. He held bilateral talks with summit host Kishida on Monday.

Albanese told his fellow Quad leaders he was dedicated to the group’s mission to maintain a free and open Indo-Pacific.

“We have had a change of government in Australia, but Australia’s commitment to the Quad has not changed and will not change,” Albanese said.

Looming over the Quad leaders’ talks was Biden’s blunt statement on Monday that the U.S. would intervene militarily if China were to invade Taiwan, saying the burden to protect Taiwan is “even stronger’ after Russia’s invasion of Ukraine. The White House insists that Biden’s unusually forceful comments about Taiwan did not amount to a shift in U.S. policy toward the self-ruled island that China claims as its own.

Asked by the reporters at the summit on Tuesday if his comments on Taiwan a day earlier were meant to mark a policy change, Biden simply replied, “No.”

Some modest initiatives were announced by the Quad leaders, including a new effort to provide pediatric COVID-19 vaccines to countries most in need and a program to help nations improve security and environmental awareness of their territorial waters.

The Quad last year pledged to donate 1.2 billion vaccine doses globally. So far, the group has provided about 257 million doses, according to the Biden administration.

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Associated Press writers Zeke Miller in Washington, Mari Yamaguchi in Tokyo and Ashok Sharma in New Delhi contributed reporting

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