Ukraine crisis: Obama says Nato will defend Baltic members

President Obama is travelling to Estonia to assure Nato members in the Baltic region of their security and warn Russia from interfering in any of those countries' affairs.

Following accusations that Russia is supporting the separatists in Ukraine, which is not a Nato member, there are concerns it could foment similar unrest in the Baltic states.

Mr Obama will then attend a Nato summit in Wales which is set to be dominated by the Ukraine crisis.

Barbara Plett Usher reports.