KANANASKIS, Alberta, June 17 (Reuters) - Ukrainian President Volodymyr Zelenskiy left the Group of Seven summit on Tuesday with new aid from host Canada for its war against Russia but said diplomacy is in"crisis" having missed the chance to press U.S. President Donald Trump for more weapons.

TheG7 wealthy nations struggled to find unity over the conflict in Ukraine after Trump expressed support for Russian President Vladimir Putin and left a day early to address the Israel-Iran conflict from Washington.

A Canadian official initially said Ottawa had dropped plans for the G7 to issue a strong statement on the war in Ukraine after resistance from the United States.

Emily Williams, director of media relations for Prime Minister Mark Carney, later said no proposed statement on Ukraine had ever been planned.

Carney had started the day by announcing Ottawa would provide C$2 billion ($1.47 billion) in new military assistance for Kyiv as well as impose new financial sanctions.

Zelenskiy said he had told the G7 leaders that"diplomacy is now in a state of crisis" and said they need to continue calling on Trump "to use his real influence" to force an end to the war, in a post on his Telegram account.

Although Canada is one of Ukraine's most vocal defenders, its ability to help it is far outweighed by the United States, the largest arms supplier to Kyiv. Zelenskiy had said he hoped to talk to Trump about acquiring more weapons.

After the summit in the Rocky Mountain resort area of Kananaskis concluded, Carney issued a chair statement summarizing deliberations.

"G7 leaders expressed support for President Trump’s efforts to achieve a just and lasting peace in Ukraine," it said.

"They recognized that Ukraine has committed to an unconditional ceasefire, and they agreed that Russia must do the same. G7 leaders are resolute in exploring all options to maximize pressure on Russia, including financial sanctions."

Canada holds the rotating G7 presidency this year. Other leaders do not need to sign off on G7 chair statements.

Trump did agree to agroup statement published on Monday calling for a resolution of the Israel-Iran conflict.

"We had a declaration given the exceptional, fast moving situation in Iran," Carney told a closing news conference.

A European official said leaders had stressed to Trump their plans to be hard on Russia and Trump seemed impressed, though he does not like sanctions in principle.

Three European diplomats said they had heard signals from Trump that he wanted to raise pressure on Putin and consider a U.S. Senate billdrafted by Senator Lindsey Graham, but that he had not committed to anything.

"I am returning to Germany with cautious optimism that decisions will also be made in America in the coming days to impose further sanctions against Russia," German Chancellor Friedrich Merz said.

G7 leaders agreed on six other statements, aboutmigrant smuggling, artificial intelligence, critical minerals, wildfires, transnational repression and quantum computing.

KREMLIN SAYS G7 LOOKS 'RATHER USELESS'

Trump said on Monday he needed to be back in Washington as soon as possible due to the situation in the Middle East, where escalating attacks betweenIran and Israel have raised risks of a broader regional conflict.

A White House official on Tuesday said Trump explained that he returned to the U.S. because it is better to hold high-level National Security Council meetings in person, rather than over the phone.

Upon arriving at the summit, Trump said that the then-Group of Eight had been wrong to expel Russia after Putin ordered the occupation of Crimea in 2014.

The Kremlin said on Tuesday that Trump was right and said the G7 was no longer significant for Russia and looked"rather useless."

Many leaders had hoped to negotiate trade deals with Trump, but the only deal signed was thefinalization of the U.S.-UK deal announced last month. Treasury Secretary Scott Bessent remained at the summit after Trump left.

Carney also invited non-G7 members Mexico, India, Australia, South Africa, South Korea and Brazil, as he tries to shore up alliances elsewhere and diversify Canada's exports away from the United States.

Carney warmly welcomed Indian counterpartNarendra Modi on Tuesday, after two years of tense relations between Canada and India.

($1 = 1.3589 Canadian dollars)