KIEV, Sept. 19 - President Petro Poroshenko said in a tweet on Friday that the United States had promised $1 billion in financial guarantees for Kiev to raise funds on the capital markets, Reuters reported.

"Agreed with @BarackObama that Ukraine will receive $1 billion in financial guarantees," he said after visiting Washington where he secured $53 million in assistance but failed to win the argument for the United States to provide Ukraine weapons to fight pro-Russian separatists in its east.