By Victor Reklaitis and Barbara Kollmeyer, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks finished with strong gains Monday, helped by deal news and easing Ukraine-Russia tensions.

A better-than-expected reading on the housing market also boosted sentiment and kicked off a big week for economic data.

The S&P 500 (SPX) rose 16.68 points, or 0.9%, to close at 1,971.74, adding to its 1.2% weekly gain last week. The benchmark index stands just 0.8% off its July 24 record close, as it's bounced back from a slump in late July and early August.

The Dow Jones Industrial Average(DJI) jumped 175.83 points, or 1.1%, to finish at 16,838.74. The blue-chip barometer achieved its biggest point gain since Aug. 8.

The Nasdaq Composite (RIXF) climbed 43.39 points, or 1%, to 4,508.31, scoring its highest close since March 2000. Yahoo Inc.(YHOO) and Google Inc.(GOOGL) (GOOG) rose 2.5% and 1.5%, respectively, as tech stocks enjoyed broad gains.

"The political concerns that whipped markets around on Friday subsided over the weekend with Ukraine and Russia apparently talking and making some progress," said Colin Cieszynski, chief market strategist at CMC Markets, in emailed comments. He also emphasized encouraging news from Iraq, noting that "Kurdish forces regained control of the key Mosul Dam from ISIS."

Alastair McCaig, market analyst at IG, pointed out the Dow might regain a big round number.

"Wall Street is once again coming up to tackle technical resistance, but with the momentum built up over the last week, conversations are likely to turn towards when, not if, it can tackle the 17,000 level again," McCaig said in a note.

Helping out, he said, was the bounce off session lows seen Friday, when the Dow recovered from a triple-digit fall. Also read: Where Soros and other big investors are putting their money right now

Foreign ministers from Ukraine and Russia met over the weekend, and an agreement was reached over a convoy of what Russia says is humanitarian aid. The news pushed the Europe Stoxx 600 to its highest close so far this month.

In U.S. economic news, the National Association of Home Builders/Wells Fargo Housing Market Index for August came in at 55, its highest level in seven months. Economists polled by MarketWatch had expected a reading of 53. U.S. stocks strengthened further after the housing report.

This week also should bring data on housing starts and consumer prices on Tuesday, as well as minutes from the last Federal Open Market Committee meeting on Wednesday.

Federal Reserve Chairwoman Janet Yellen will give a speech Friday at the annual Fed summit in Jackson Hole, Wyo. Yellen is expected to say there's still slack in the job market, and she isn't likely to change the Fed's easy-money stance, said Jan Hatzius, chief economist at Goldman Sachs, in an interview with MarketWatch.

Dollar General makes play for Family Dollar

Shares of Dollar General Corp.(DG) rose 12%, faring best in the S&P 500, after offering to buy rival Family Dollar Stores Inc. (FDO) in an all-cash deal worth $78.50 a share. That's higher than Dollar Tree Inc.'s (DLTR) cash-and-stock bid in July of $74.50 a share. Family Dollar jumped 4.9% for the second-best gain in the S&P 500. (Read more about the day's notable moves in the Movers & Shakers column http://www.marketwatch.com/story/jinkosolar-urban-outfitters-stocks-to-watch-monday-2014-08-17.)

In commodity markets, oil prices(CLU4) fell after Iraqi Kurds recaptured a large chunk of the biggest dam in the country from Islamist militants, with help from U.S. air power.

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