U.S. President Donald Trump told Russian President Vladimir Putin on Sunday that ending the conflict in Ukraine was vital and he was ready to help, Russian news agencies quoted Kremlin foreign policy adviser Yuri Ushakov as saying. "As regards the Ukrainian conflict, Donald Trump again emphasised that a cessation of hostilities was vital," Ushakov was quoted as telling journalists. "The situation around the memorandum between the U.S. and Iran was discussed," Ushakov was quoted as saying. "Donald Trump said an agreement was close and he expects that the results of the difficult but ultimately successful negotiations can be made public."...