The release of Ukraine's former prime minister Yulia Tymoshenko has been welcomed by European Union foreign policy chief Baroness Ashton.
In a statement she said the EU is "following minute by minute the rapidly changing political situation in Ukraine".
"I call on all sides to continue engaging in a meaningful dialogue to fulfil the legitimate democratic aspirations of the Ukrainian people," she added.
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Detectives in Westminster are investigating after the man was discovered on the Route 189 bus in Marylebone shortly after midnight.
The murderer was shaking and appeared to be gasping for air for around 13 minutes before dying.