Foreign Secretary William Hague said that no Western nation advocated military intervention in Syria.
"No Western government is advocating military intervention of Western nations into the conflict in Syria," Hague told parliament. "The discussion is entirely focused on the degree of assistance that can and should be delivered to the opposition."
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."