Russian forces may have to advance as far as Kyiv or Lviv in Ukraine, Russia's former president Dmitry Medvedev said in an interview to Russian news agencies.

"Nothing can be ruled out here. If you need to get to Kyiv, then you need to go to Kyiv, if to Lviv, then you need to go to Lviv in order to destroy this infection," RIA Novosti quoted Medvedev as saying on Friday. (Reporting by Reuters; Editing by Christian Schmollinger)