Qatar, which hosts the largest U.S. air base in the Middle East, has spoken out against Washington’s decision to block all exports of Iranian oil, saying unilateral sanctions were unwise because they hurt the countries that rely on the supplies. The United States has demanded that buyers of Iranian oil stop purchases by May 1 or face the prospect of sanctions, ending six months of waivers that had allowed Iran’s eight biggest customers, most in Asia, to import limited volumes. “The sanctions should not be extended because they have an adverse impact on countries benefiting from Iranian oil,” Qatar’s foreign minister Sheikh Mohammed bin Abdulrahman al-Thani said on Wednesday. “In Qatar, we do not believe unilateral sanctions bring positive effects for crises which must be solved through dialogue […]