Kerry said this on Friday during talks with Russian Foreign Minister Sergey Lavrov, media reported. "We had productive talks with President Putin... However, we still have to do much homework, and I think there are all opportunities to provide a real settlement [of the situation in Ukraine]," the US Secretary of State said. However, according to Kerry, there are still some unresolved issues between Moscow and Washington. He noted he hoped that they would be eliminated in the course of Friday talks. The US Secretary of State also said that his yesterday's conversation with Putin was "very plain and frank."