The movement of aid trucks into Ukraine represents a "direct invasion," Ukrainian state security chief Valentyn Nalivaychenko said.
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German news agency dpa reported that prosecutors decided to seek Mr Stadler’s arrest due to fears he might try to evade justice.
David Dimbleby is stepping down after 25 years presenting the BBC show.
British Transport Police (BTP) were called to Loughborough Junction station in south London at 7.30am on Monday.