The first trucks from a humanitarian aid convoy sent into Ukraine have returned to Russia.
Their journey into east Ukraine was not sanctioned by the Ukraine government and drew condemnation from the US and Germany.
German Chancellor Angela Merkel is due to arrive in Ukraine to discuss the situation.
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Theresa May scraped through Commons votes on customs with support from Labour MPs.
Another minister resigned as the Government narrowly won a vote on its customs bill after Theresa May bowed to pressure from Tory Brexiters.
Theresa May had to rely on the support of Labour MPs on a controversial proposal.