US Secretary of State John Kerry warned Russia that it must not intervene in Ukraine under the "pretext of peacekeeping", his department said.
The statement follows Russia's version of the call, in which its Foreign Minister Sergei Lavrov was said to have called for urgent measures to avert a "humanitarian catastrophe" in the east of the country.
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A man in the 40s was killed in southern Poland and a further 33 people injured in Germany.
There will be plenty of sunny spells but showers may make their way across Wales, Northern Ireland and western Scotland.
The station's decision not to renew the former London mayor's contract follows his controversial comment about Hitler supported Zionism.