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ABC News covers the latest on the mysterious disappearance of Malaysian Air Flight 370 and Ukraine's referendum on the future of Crimea, Sunday on "This Week."

House Counterterrorism and Intelligence Subcommittee Chair Rep. Peter King, R-N.Y., discusses the Malaysian Air mystery. And following his visit to Kiev this week, Senate Foreign Relations Committee member Sen. Chris Murphy, D-Conn., weighs in on the standoff in Ukraine and how the U.S. will respond.

Plus, George Stephanopoulos goes one-on-one with billionaire Bill Gates on the battle over Common Core teaching standards, only on "This Week.

And the powerhouse roundtable debates all the week's politics, with ABC News political analyst Matthew Dowd, Georgetown University professor and MSNBC political analyst Michael Eric Dyson, Weekly Standard editor and ABC News contributor William Kristol, editor and publisher of The Nation Katrina vanden Heuvel, and Fox News anchor Greta Van Susteren.

See the whole political picture, Sunday on "This Week."

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