UPDATE 2-Syria, North Korea top G8 meeting in London
* First face-to-face talks since failed Iran meeting
* Syrian National Coalition leaders to meet some ministers
* Britain will press case for more aid for opposition (Add details, quotes)
By Natalie Huet and Arshad Mohammed
LONDON, April 10 (Reuters) - Western and Middle Eastern nations trying to help the Syrian opposition in its war against President Bashar al-Assad will meet in Turkey on April 20, a U.S. official said on Wednesday as G8 foreign ministers gathered in London for a summit.
U.S. Secretary of State John Kerry will attend the meeting of the so-called Friends of Syria "core group" in Istanbul, said the official, who spoke to reporters on condition of anonymity.
The G8 talks, which began in London over dinner on Wednesday and were due to end on Thursday, will also be the first chance for the ministers to discuss face-to-face the failure of last week's meeting in Almaty on curbing Iran's nuclear programme.
North Korean threats of war also will be high on the agenda of the Group of Eight nations - the United States, Britain, France, Germany, Italy, Japan, Canada and Russia - meeting.
Britain was expected to call for more help for the Syrian opposition but there are no signs of a major shift in policy. Continued...