Adds RBNZ decision in paragraphs 2 and 11, Samsung labour deal 6, Australia inflation 12

By Rocky Swift

TOKYO, May 27 (Reuters) - Asian shares climbed to record highs while oil prices remained elevated on Wednesday, as markets looked for signals that a shaky truce between the United States and Iran will be extended.

The dollar held gains from the previous session after Iran said the U.S. had violated a ceasefire. New Zealand's dollar rose after the central bank kept its policy rate unchanged but signalled future hikes will need to come sooner.

Japanese and South Korean shares scaled fresh peaks after major U.S. stock markets reopened from a holiday to rise to all-time highs on AI optimism. Sentiment remains vulnerable, however, as talks continue to reach a lasting halt to the three-month-long conflict that has rocked energy markets, and central banker comments will be watched for how the crisis is affecting the outlook for inflation and interest rates.

"The markets are just waiting for something tangible now when it comes to a deal between the U.S. and Iran," Kyle Rodda, senior financial market analyst at Capital.com, wrote in a note.

"A lot of good news is priced in, leaving room for disappointment if something comprehensive isn't announced."

MSCI's broadest index of Asia-Pacific shares outside Japan .MIAPJ0000PUS advanced for a fifth straight session, rising 1.9% to an all-time high. Japan's Nikkei jumped 1%, briefly trading above the 66,000 mark for the first time.

South Korea's KOSPI soared 4.3%, extending gains after Samsung Electronics' 005930.KS unionised workers voted to approve a tentative wage deal averting a strike that threatened to rattle global chip supplies.

In early European trades, the pan-region Euro Stoxx 50 futures STXEc1 were up 0.18%, German DAX futures FDXc1 rose 0.1%, and FTSE futures FFIc1 slipped 0.1%. U.S. stock futures, the S&P 500 e-minis ESc1, edged up 0.09%.

In currency markets, the dollar index =USD, which measures the greenback against a basket of currencies, rose 0.01% to 99.11 after a 0.15% gain in the prior session. The euro EUR= rose 0.07% to $1.1636, and the yen JPY= was little changed at 159.28 per dollar.

Iran's foreign ministry said U.S. strikes in the southern Hormozgan province represented a "gross violation" of a ceasefire. The U.S. said its attacks were defensive in nature.

U.S. Secretary of State Marco Rubio said a deal with Tehran to halt the conflict could "take a few days," while Iran's Tasnim news agency reported that Tehran was seeking the release of $24 billion in funds frozen overseas.

U.S. crude CLc1 fell 1.24% to $92.73 a barrel, and Brent LCOc1 slipped to $98.70 per barrel, down 0.88% on the day, after a nearly 4% surge in the prior session.

The Reserve Bank of New Zealand held interest rates steady at 2.25% in a split board decision that emphasised the need for rates to move up sooner. The kiwi NZD= strengthened 0.58% versus the greenback to $0.587.

In Australia, data showed consumer prices increased by less than expected in April while core inflation ticked up. The Aussie AUD= weakened 0.1% to $0.716.

At a meeting of central bankers in Tokyo, Bank of Japan Governor Kazuo Ueda cautioned that a temporary energy shock can become persistent if it feeds into wages and price-setting behaviour. European Central Bank board member Isabel Schnabel on Tuesday advocated for an interest rate hike in June even if a U.S.-Iran peace deal is reached.

Spot gold XAU= fell 0.07% to $4,502.72 an ounce, while copper rose 0.52% to $13,695.00 a metric ton.

In cryptocurrencies, bitcoin BTC= fell 0.40% to $75,711.92, and ether ETH= declined 0.26% to $2,070.46.