Ukrainian President Petro Poroshenko has said that "Crimea was, is, and will be Ukrainian" but stated he does not want war or revenge, during his inaugural speech.
He said: "I don't want war; I don't want revenge. I want peace and I want peace to happen," Poroshenko told parliament after taking the oath.
In his inaugural speech he said that he would offer a safe corridor for Russian fighters to go home and that he would "guarantee immunity to all."
He said: "Please, lay down the guns and I guarantee immunity to all those who don't have bloodshed on their hands."
More top news
Tennis star Serena Williams has hit back at Romania's tennis captain Ilie Nastase, accusing him of racially abusing her and her unborn baby.
Newcastle United have confirmed their promotion back to the Premier League at the first time of asking.
The United States has sanctioned 271 Syrian government employees in response to Bashar Assad's alleged use of chemical weapons.