BULBOACA, Moldova, June 1 (Reuters) - President Volodymyr Zelenskiy pressed his case for Ukraine to be part of the NATO military alliance as he joined European leaders on Thursday in Moldova ahead of an expected counter-offensive against Russia's invasion. Diplomatic sources said a speech from French President Emmanuel Macron in Bratislava on Wednesday in which he called for EU enlargement "as quickly as possible" was a signal that Paris, once hesitant, would back EU membership talks for Ukraine and Moldova to start at the end of the year. Moldova has taken in more Ukrainian refugees per capita than any other country just as food and energy prices soared as a result of the conflict