BBC News with Jerry Smit. Top level talks between the United States and Russia to try to ease the crisis over Ukraine have ended in stalemate. After hours of discussions in London, the Russian foreign minister, Sergei Lavrov, said there had been no common vision with his US counterpart John Kerry. Speaking through an interpreter, Mr. Lavrov said a referendum on Sunday in Crimea on whether to join Russia should go ahead on schedule. We have repeated our position that was expressed by the President of the Russian Federation. ________________________________________ 杰瑞.施密特为您带来的BBC新闻报道. 美俄双方就试图解决乌克兰危机的最高级别对话最终陷入僵局.双方在伦敦进行数小时讨论后,俄外长谢尔盖.拉夫罗夫表示,未与美国国务卿约翰.克里达成一致.通过一名翻译,拉夫罗夫称,就克里米亚是否加入俄联邦的全民公投将在周日如期举行. 我们重申了俄联邦总统对此事的态度.______________________________