Petro Poroshenko takes oath of office as Ukrainian president

Petro Poroshenko took the oath of office as Ukraine's president, assuming leadership of a country mired in a violent uprising and economic troubles.

Poroshenko, who became a billionaire as a candy tycoon, was elected on May 25, three months after the pro-Russian president Viktor Yanukovych fled the country in the wake of months of street protests.

In his inaugural speech, Poroshenko was expected to detail plans for ending a pro-Russian separatist uprising in the country's east that broke out after Yanukovych's ouster.