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KNOW IT ALL: Monday's Top Stories at NBC News

From new leads in the search for the missing jet to a deadly mudslide in Washington, see the stories we're following.

Good morning, and happy Monday. Here are six of the top stories we are following this morning at NBC News:

1. Objects spotted by plane in search for missing jet

One of the 10 Australian planes searching Monday for the missing Malaysian jet spotted "circular" and "rectangular" objects in the southern Indian Ocean. Australian officials believe they may be able to retrieve the objects by Monday night or Tuesday morning. Read more in NEWS.

2. Death toll rises to eight in Washington mudslide

At least 18 people are still unaccounted for, eight were killed and another eight were injured by a mudslide in Snohomish County, Washington, that spanned a square mile. Rescuers had trouble on Sunday finding and getting to potential victims as the mud was 15 feet deep in some places and a blocked river threatened flash floods. Read more in NEWS.

3. Obama arrives in Europe amid Russia tensions

"If Russia continues to escalate the situation, we need to be prepared to impose a greater cost," President Barach Obama said In an interview with a Dutch newspaper, published before he arrived in Amsterdam on Monday. From the Netherlands, Obama will head to Belgium, Italy and Saudi Arabia in an effort to isolate Russia and dissuade Putin from moving deeper into Ukraine. Read more in NEWS.

4. East Coast readies for another winter storm … in spring

Even though spring is officially here, winter won't quit. The East Coast will endure another blast of cold for much of the week, and if that cold converges with moisture, the Northeast could get a blizzard. New England bears the greatest risk for the several inches, while New York and New Jersey may get a dusting. View more in Weather.

5. Oil spill blocks busy Texas Ship channel

Approximately 168,000 gallons of "heavy crude oil" spilled into the Houston Ship Channel when a barge collided with a cargo ship Saturday, and crews are still cleaning up the mess. Cruise ships were blocked from docking and departing, and some wildlife were affected in the spill. Read more in NEWS.

6. Madness: More brackets busted

There are some surprises in the "Sweet 16" teams heading to the second weekend of the NCAA men's basketball tournament. Over the weekend, No. 11 Dayton, No. 11 Tennessee and No. 10 Stanford join top seeds Florida, Virginia and Arizona as March Madness heads toward April. Read more in SPORTS.

… What’s trending today?

Jump back! After Jimmy Fallon dramatically unraveled an edict outlawing dancing on the Tonight Show, Footloose star Kevin Bacon, kicked off his Sunday shoes and danced into the studio just as skillfully as he did 30 years ago in the movie. Fallon proceeded to rip the "no-dancing" edict in half.