Russian expert James Nixey told ITV News that he does not think the meeting between Russian President Putin and Prime Minister Cameron will "result in a substantial change in position."
He says there is still a "fundamental divergence of values" on the issue, and he does not think "one pre-judo meeting" will accomplish.
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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.