.Oil prices on Wednesday remained elevated as markets looked for signals that a fragile ceasefire between the United States and Iran would hold, while investors closely monitored developments around a possible long-term deal.Brent crude traded near $95.39 per barrel after Iran accused the US of violating the truce. US crude futures fell 0.89% to $93.05 a barrel, Reuters reported. Asian shares rose with Japan's Nikkei hitting a record high and Wall Street optimism over artificial intelligence continuing to support market sentiment, even as investors remained cautious over the fragile US-Iran ceasefire and its impact on global energy markets.Japan's Nikkei share gauge jumped to a record level, following all-time highs on Wall Street after US markets reopened following a holiday. MSCI's broadest index of Asia-Pacific shares outside Japan rose 1.2%, while the Nikkei surged 1.8%.Sentiment, however, remained vulnerable as negotiations continued over a lasting halt to the three-month-long conflict that has rattled energy markets. "The markets are just waiting for something tangible now when it comes to a deal between the US and Iran," Kyle Rodda, senior financial market analyst said in a note. "A lot of good news is priced in, leaving room for disappointment if something comprehensive isn't announced."Iran’s foreign ministry said US strikes in the southern Hormozgan province amounted to a 'gross violation' of the ceasefire, while Washington maintained the attacks were defensive in nature.US Secretary of State Marco Rubio said a potential agreement with Tehran to end the conflict could take 'a few days', while Iran's Tasnim news agency reported that Tehran was seeking the release of $24 billion in frozen overseas funds.In currency markets, the dollar index was little changed at 99.09 after gaining 0.15% in the previous session. The euro rose 0.09% to $1.1638, while the Japanese yen strengthened 0.05% to 159.19 per dollar.Spot gold rose 0.36% to $4,522.14 an ounce, while copper gained 0.46% to $13,686.50 a metric ton. In cryptocurrencies, bitcoin slipped 0.18% to $75,883.90, while ether was little changed at $2,075.39.