U.S. and Russia agree on nuclear terrorism threat - up to a point

THE HAGUE (Reuters) - World leaders called on countries on Tuesday to cut their use and their stocks of highly enriched nuclear fuel to the minimum to help prevent al Qaeda-style militants from obtaining material for atomic bombs.

Winding up a third nuclear security summit since 2010, this one overshadowed by the Ukraine crisis, 53 countries - including the United States and Russia at a time of high tension between them - agreed much headway had been made in the past four years.