By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market finished Tuesday with the best gains this year as the S&P 500 closed at a record high for the 49th time in the past 12 months.

Risk appetite returned after reports that Russian troops ended military exercises in the border regions with Ukraine, easing tensions that spooked investors the previous session.

The benchmark S&P 500 index and blue chips recorded their best one-day percentage gains since Dec. 18, 2013.

The S&P 500 index (SPX) finished near session highs, adding 28.18 points, or 1.5%, to 1,873.91 at the close, with financials and health-care sectors leading all 10 main sectors higher.

The Dow Jones Industrial Average (DJI) gained 227.85 points, or 1.4%, to 16,395.88, with all 30 components closing higher.

The Nasdaq Composite (RIXF) gained 74.67 points, or 1.8%, to 4,351.97, its best one-day point gain since Oct 10, 2013. The tech-heavy index closed at the highest level since April 2000.

The Russell 2000 (RUT) index of small-cap stocks also closed at a record high, adding 32.29 points, or 2.8% to 1,208.65.

Read the recap of our stock market live blog.

"The events such as yesterday trigger corrections in markets and not bear markets," said Steven Krawick, chief investment officer at West Chester Capital Advisors. "Economic conditions are still favorable, the Fed is committed to keeping the rates low and while we consider valuations as high, they are not at extreme levels. With these underpinnings, selloffs such as yesterday are temporary and provide an opportunity to buy."

With no economic reports scheduled, geopolitical news dominated Tuesday's trading. Investors welcomed news that Russian President Vladimir Putin ordered troops stationed on the border with Ukraine back to base after the completion of military exercises. International observers had become nervous over the exercises in central and western Russia because they have been used in the past as a cover for military action.

Meanwhile, President Barack Obama said a Putin news conference earlier Tuesday was just a smoke screen to justify an illegal invasion.

Among individual stocks, Delta Air Lines Inc. (DAL) climbed 5.7% after the airline on Tuesday said its consolidated passenger unit revenue in February increased 4% year over year on strong domestic demand.

Lorillard Inc. (LO) rose 3.1% in the wake of a Financial Times report that Reynolds American Inc. (RAI), maker of Camel brand cigarettes, is exploring a possible buyout of Lorillard in a deal that could value Lorillard at more than $20 billion. Shares of Reynolds were up 5.7%.

Shares of Oxygen Biotherapeutics Inc. (OXBT) surged 15% after the pharmaceutical company said Tuesday the U.S. Food and Drug Administration has allowed it to go ahead with testing of its Oxycyte treatment, which had been on clinical hold.

Plug Power Inc. (PLUGD) shares leapt 15% after analysts at Cowen and Co. raised their price target on the firm on Monday.

J.C. Penney Co. Inc. (JCP) shares jumped 4.1% after Standard & Poor's Ratings Services on Monday boosted its outlook on the retailer to stable from negative.

Tesla Motors Inc. (TSLA) shares rose 1.7%. The electric-car company Tuesday announced expansion plans in Europe. Adam Jonas, an analyst at Morgan Stanley, said that Tesla could disrupt the energy industry if its "gigafactory" can produce batteries at a cost that is low enough. Morgan Stanley has an overweight rating and a price target of $320 on Tesla shares. Shares have surged nearly 67% this year through Monday's close.

RadioShack Corp. (RSH) tumbled 17% to $2.25 after the struggling electronics retailer missed earnings estimates and said it would close about one-fifth of its stores.

As stocks rallied, gold and oil prices pulled back from highs seen on Monday. Gold for April delivery (GCJ4) fell 1.1%, and West Texas Intermediate (CLJ4) crude fell 1.5%.

Asian shares had a mixed session, though Hong Kong's Hang Seng Index , one of Asia's worst-hit markets on Monday, added 0.7%, and Toyko shares also rose. Beaten-down European stocks rebounded; the Stoxx Europe 600 index jumped 1.9%.

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