Definition: In this task, you are given a text of the article. Your task is to generate a headline (title) for this article.
Input: russian president dmitry medvedev on thursday demanded ukraine repay #.# billion dollars -lrb- #.# billion euros -rrb- of debt to russian energy giant gazprom , saying kiev could be `` forced '' to pay up .

medvedev demands ukraine repay #.# billion dollar gas debt