An MH-60R Sea Hawk helicopter launches during flight operations aboard the US Navy aircraft carrier USS Ronald Reagan in the South China Sea, July 17, 2020. 鈥 US NAVY/MASS COMMUNICATION SPECIALIST 2ND CLASS CODIE L. SOULE/HANDOUT VIA REUTERS.

TOKYO/WASHINGTON 鈥 Leaders of the Quad grouping of countries 鈥 the United States, India, Australia, and Japan 鈥 agreed on Thursday that what is happening to Ukraine should not be allowed to happen in the Indo-Pacific, the prime ministers of Japan and Australia said.

A virtual meeting of the four-country grouping was held at a time of increased concern about Taiwan, a self-ruled island claimed by China that has stepped up its alert level since Russia鈥檚 invasion of Ukraine, wary of Beijing taking advantage of a distracted West to move against it.

鈥淲e鈥檝e agreed that unilateral changes to the status quo with force like this should not be allowed in the Indo-Pacific region,鈥 Japanese Prime Minister Fumio Kishida said, referring to Russia鈥檚 invasion.

鈥淲e鈥檝e also agreed this development makes it even more important to work toward realizing a free and open Indo-Pacific,鈥 Mr. Kishida told reporters after the meeting with US President Joseph R. Biden, Jr., Australian Prime Minister Scott Morrison, and Indian Prime Minister Narendra Modi.

鈥淲e cannot allow what is happening in Ukraine now to ever happen in the Indo-Pacific,鈥 Mr. Morrison said in a statement after the meeting.

鈥淲e are resolute in our commitment to a free and open Indo-Pacific region where smaller states do not need to live in fear of more powerful ones,鈥 he added.

A joint Quad statement said the leaders met to 鈥渞eaffirm their commitment to a free and open Indo-Pacific, in which the sovereignty and territorial integrity of all states is respected and countries are free from military, economic, and political coercion.鈥

The leaders, whose call followed a meeting of their foreign ministers in Australia last month, also 鈥渞eaffirmed their dedication to the Quad as a mechanism to promote regional stability and prosperity.鈥

The statement, which added that the leaders agreed to meet in person in Tokyo 鈥渋n the coming months,鈥 made no specific mention of Taiwan, but said the leaders discussed the conflict and humanitarian crisis in Ukraine.

鈥淭hey agreed to stand up a new humanitarian assistance and disaster relief mechanism which will enable the Quad to meet future humanitarian challenges in the Indo-Pacific and provide a channel for communication as they each address and respond to the crisis in Ukraine,鈥 it said.

Mr. Biden tweeted that the meeting with the Quad leaders covered 鈥渙ur commitment to sovereignty and territorial integrity around the world, including in the Indo-Pacific.鈥

Taiwan鈥檚 representative office in Washington said it welcomed the Quad鈥檚 commitment to a free and open Indo-Pacific. 鈥淭aiwan will continue to work with all peace-loving partners in the region for prosperity and stability,鈥 it said.

Mr. Modi 鈥渦nderlined that the Quad must remain focused on its core objective of promoting peace, stability and prosperity in the Indo-Pacific region,鈥 his office said.

It said developments in Ukraine were discussed, including its humanitarian implications, and Mr. Modi 鈥渆mphasized the need to return to a path of dialogue and diplomacy.鈥

Washington sees the Quad and its growing relations with India as essential to its efforts to push back against China, but it is in a delicate balancing act with New Delhi, given the latter鈥檚 long-standing ties with Russia.

Of the Quad countries, only India has not condemned Russia鈥檚 invasion of Ukraine. Russia is the main supplier of arms to the Indian military, and India faces the possibility of US sanctions for its purchase of Russia鈥檚 S-400 air defense system.

Analysts say any moves by US Russia hawks to impose sanctions on India for working with Moscow could set back Quad cooperation.

Donald Lu, US assistant secretary of state for South Asia, told a Senate subcommittee hearing on Wednesday that Washington had been fighting a 鈥減itched battle鈥 with India in diplomatic channels to urge it to take a clear position opposed to Russian actions in Ukraine.

He also said it was looking 鈥渧ery closely鈥 at whether to apply sanctions on India over its Russian arms deals. 鈥斅Kiyoshi Takenaka, David Brunnstrom, and Michael Martina/Reuters