Obama warns against Ukraine invasion

President Obama spoke about the crisis in Ukraine on Friday afternoon.

AP

President Obama expressed concern for the crisis and said this afternoon ‘‘there will be costs’’ for any military intervention.

Masked men appear at airports in Crimea

The men, who are of uncertain allegiance, fueled concerns about possible Russian military intervention or a separatist rebellion.

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/12/12/BostonGlobe.com/HealthScience/Advance/Images/kreiter_mito-handout_met.jpg Mass. agency works to return teen to Conn.

Officials said they are actively working to return Justina Pelletier, who has been embroiled in a medical custody battle, to her home state.

Dzhokhar Tsarnaev captured in Watertown

Tsarnaev remarks ‘to his detriment’ overheard by FBI

An FBI agent allegedly overheard remarks the alleged Marathon bomber made during a meeting with his sister.

The Callahan Tunnel has been closed for construction since December.

Callahan Tunnel on track to reopen by March 12 deadline

Officials will know by next week if the tunnel will reopen to traffic March 12, or sometime in the preceding two days.

BOSTON, MA , 02/ 28/ 14: SHAME...enclosed in glass and in handcuffs in the courtroom for their The four students covered their faces during a court hearing Friday.

BU students accused of hosting wild parties released from jail

“The message that the court was interested in sending is received,” one of the student’s lawyers said.

Philip Seymour Hoffman.

Hoffman died from toxic mix of drugs, coroner says

Philip Seymour Hoffman died from a mix of heroin, cocaine, amphetamines, and benzodiazepines, tests allegedly show.

Opinion

LAWRENCE HARMON

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2014/02/28/BostonGlobe.com/EditorialOpinion/Images/Lawrence_Harmon-1607.jpg Bridgewater Hospital death a disgrace

Joshua Messier’s 2009 death has the earmarks of a crime, and it should be investigated accordingly.

Sports

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Bob Ryan

C.J. Fair of Syracuse was called for this charging foul against Duke on Feb. 22.

‘Taking a charge’ should be outlawed in basketball

Someone please tell me what sense it makes to reward a defender for just standing there? Shouldn’t he be required to make a play of some sort?

Arts

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stage review

Timberly Canale and Mikhail Baryshnikov take a tumble together in ArtsEmerson’s “Man in a Case.”

Baryshnikov adds grace to ‘Man in a Case’

Adapted from a pair of stories by Anton Chekhov, the mixed-media theater piece is a somber and visually striking 75 minutes at the Emerson/Cutler Majestic Theatre.

Movies

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the 2014 Academy Awards

From top: Joaquin Phoenix listening to the voice of Scarlett Johansson in “Her” and Sarah Paulson in “12 Years a Slave.”

Overlooked by Oscar

Ten instances where the Academy of Motion Picture Arts and Snubs (er, Sciences) overlooked a worthy nominee from last year.