Stocks on Wall Street were mixed on Tuesday after robust U.S. consumer confidence data, while Russian assets rose after major industrialized nations warned of additional sanctions without committing to a particular action, Reuters reported.U.S. consumer confidence rose more than expected in March, climbing to its highest level since January 2008. The report was the latest in a string of positive reads on the economy that supported views that softness early this year was related to bad weather and not weakening fundamentals. Biotech shares fell after a rebound at the open, extending their bearish streak for a fifth straight day. Some Internet stocks were up after Monday's mauling.Investor spirits brightened after a meeting of Western leaders ended with little more than fist-shaking at Russia and news emerged that Moscow's and Kiev's foreign ministers had held an impromptu first meeting.Sanctions have been imposed against Moscow for its seizure of Crimea, but investors say asset freezes have had little effect.Shares in Moscow rose, with the Micex Index gaining 2 percent, while the rouble gained 1 percent against the dollar.The Dow Jones industrial average was up 27.62 points, or 0.17 percent, at 16,304.31. The Standard & Poor's 500 Index was down 0.31 points, or 0.02 percent, at 1,857.13. The Nasdaq Composite Index was down 20.16 points, or 0.48 percent, at 4,206.23The rebound was an indication that while concerns persist about geopolitical tensions in Ukraine and slowing growth in China, investors were not bearish on equities wholesale.A measure of world equity markets edged up 0.29 percent.Long-dated U.S. debt prices fell and short-dated Treasury prices rose, interrupting a four-day trend in which shorter-dated debt weakened more quickly than longer-term bonds.That has flattened the yield curve, narrowing the difference between short- and long-dated securities, which suggests more concern about higher rates and a bit less confidence in long-termgrowth.Two-year Treasuries, the most sensitive to interest rate changes, were steady at 0.4250 percent after reaching a six-month high of 0.4650 percent on Monday. The Treasury will auction $32 billion in two-year notes in the early afternoon. The benchmark 10-year U.S. Treasury note was unchanged, its yield at 2.7353 percent.The euro dipped after ECB hawk and Bundesbank chief Jens Weidmann said it was not out of the question for the ECB to buy assets to combat super-low inflation.European stocks were up 1.2 percent and on course for their biggest rise in almost a month. Adding to the upbeat mood was talk China may launch fresh stimulus to keep up the pace of its economic growth.The dollar moved higher against most major currencies while the euro and yen were under pressure, along with a number of emerging market currencies.The euro fell 0.3 percent to $1.3792. Weidmann's comments, together with a below-forecast German Ifo business sentiment survey, also pushed down yields on euro zone government bonds.U.S. gold futures were little changed at $1,310.73 an ounce. Spot gold was modestly higher, rising $1.88 to $1311 an ounce.