JUDY WOODRUFF:

But first to our series this week on the conflict in eastern Europe.

Last night, we reported from the self-declared Donetsk People's Republic, where Moscow-backed separatists have been fighting to join Russia.

Tonight, we move inside Ukraine, where the government face two fronts, internal corruption and the separatists in the east.

Special correspondent Nick Schifrin, with the help of the Pulitzer Center on Crisis Reporting, begins in the Black Sea port city of Odessa.