Major US stock indexes closed mixed on Monday after early gains faded, as fluctuating crude oil prices and ongoing geopolitical tensions between the United States and Iran weighed on investor sentiment.

The S&P 500 Index slipped 0.07 percent, while the Nasdaq 100 Index dropped 0.45 percent.

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In contrast, the Dow Jones Industrial Average managed a 0.32 percent gain.

June E-mini S&P futures fell 0.12 percent and June E-mini Nasdaq futures declined 0.48 percent, reflecting the volatile trading session, according to data from Detik Finance.

Oil Prices Swing on Iran Diplomatic Stalemate

Crude oil prices initially surged to a three-week high, pushing the 10-year Treasury note yield to a 15-month high of 4.63 percent.

The rise in yields pressured equities before a late-day retreat in energy costs helped stocks recover from their lowest levels.

The oil market reacted strongly to statements regarding international diplomacy and defense deployments in the Middle East.

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Iran described US demands for ending the war as "excessive and unrealistic," despite draft changes.

The rejection of those terms initially drove oil prices higher. However, a subsequent price collapse followed diplomatic updates from the US administration.

President Trump warned on Sunday that "the clock is ticking" regarding Iran, adding that the nation "better get moving FAST on a peace deal, or there won't be anything left of them."

The American President later altered the immediate military trajectory after direct interventions from allied leaders in the Gulf region.

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Reuters reported a deployment of 8,000 Pakistani troops, fighter jets, and an air defense system to Saudi Arabia under a mutual defense pact, describing it as a "substantial, combat-capable force."

Housing Data Provides Support, China Figures Disappoint

Domestic economic indicators offered some support for equities.

The May NAHB housing market index unexpectedly climbed three points to 37, beating expectations of no change at 34.

Conversely, downcast economic figures from China limited global growth optimism. Industrial production rose 4.1 percent year-over-year, missing the forecast 6.0 percent expansion.

Chinese retail sales grew by a weak 0.2 percent year-over-year against a predicted 2.0 percent increase.

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New home prices dropped 0.19 percent year-over-year, marking the thirty-fifth straight month of declines.