"We plan a diplomatic surge in the Middle East and south Asia by raising the number of staff by 30 percent," he said.
"That means we can deepen our engagement with Pakistan to prevent the growth of extremism there, including by spending an extra 80 million pounds (107 million euros, 158 million dollars) on counter-radicalisation.
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Miliband said the Foreign Office would prioritise work on conflict prevention, with greater co-ordination between international development officials and the military, particularly in places like Afghanistan and Iraq.
Britain would also up its work in areas like combating climate change and seek to increase the effectiveness of international institutions like the European Union and the United Nations, he added.
The Foreign Office played