KIEV, June 7 - Ukraine's new president Petro Poroshenko said his country would never give up Crimea and would not compromise on its path towards closer ties with Europe, spelling out a defiant message to Russia in his inaugural speech on Saturday, Reuters reported.

The 48-year-old billionaire took the oath of office before parliament, buoyed by Western support but facing a crisis in relations with Russia as a separatist uprising seethes in the east of his country.