World leaders will gather for a donor conference in London on Thursday in an attempt to raise £6.2bn ($9bn; €8.3bn) for those affected by the war in Syria.
Some 70 leaders are expected to attend the conference, the fourth of its kind, including UK PM David Cameron and German Chancellor Angela Merkel.
They are aiming to raise funds for education and jobs for Syrian refugees.
Hours before the conference was due to begin, peace talks between the Syrian regime and opposition were suspended.
The United Nations-brokered talks in Geneva, which opened just two days ago, were expected to resume on 25 February.
Staffan de Mistura, the UN's special envoy at the talks, admitted there had been a lack of progress but said that the negotiations had not failed.