A tense phone call between Russian Foreign Minister Sergey Lavrov and US Secretary of State Marco Rubio and a tough memo from Moscow prompted Washington to cancel a top-level peace summit in Budapest, the Financial Times  reported on Friday. US President Donald Trump and Russian leader Vladimir Putin were due to discuss ending the Ukraine war at a conference in Budapest. Last week, however, Washington scrapped those plans. Moscow's memo reportedly demanded Ukraine to give up large parts of its

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