LUGANO, Switzerland (Reuters) – Switzerland has given a cool response to calls from Ukraine’s prime minister to use frozen assets of ultra-wealthy Russians to help fund his country’s $750 billion reconstruction project. Ukrainian Prime Minister Denys Shmygal told a conference in Lugano that $300-500 billion of Russian assets had been frozen by the United States, European Union and Britain, money he said could help rebuild wrecked schools, hospitals and homes. “We propose to find (a) formula to create national and international legislation for (creating the) possibility of confiscation of froze…