U.S. stock-market indexes struggled for direction at the open on Tuesday, with bank stocks rising as the Fed is expected to raise interest rates on Wednesday, while a historic U.S.-North Korea summit failed to improve sentiment.
The Dow Jones Industrial Average edged 0.10 percent higher to 25,346.82. The S&P 500 added 0.13 percent, to 2,785.60. The Nasdaq Composite was up 0.18 percent, at 7,673.87.
Markets in the Asia-Pacific region were mostly calm, with stocks in key markets were virtually flat.
European stocks reversed early gains, with the Pan-European Index trading unchanged at 387.87 after climbing as much as 0.4 percent.
WTI crude futures for July were stable at $66.70 per barrel.
Gold futures slipped 0.3 percent to $1,298.90 an ounce.