World leaders began arriving in the Netherlands Sunday, ahead of a two-day nuclear security summit that is expected to be overshadowed by the crisis in Ukraine.
Delegations from 53 countries will take part in the summit that starts Monday at The Hague. They will meet on reducing and securing nuclear supplies, and keeping them out of extremists' hands.
The summit will form the backdrop for an emergency meeting of the Group of Seven leaders on Russia's annexation of Crimea. The G7 leaders from the U.S., Britain, Germany, Japan, France, Italy and Canada are scheduled to meet Monday afternoon.
Russian President Vladimir Putin is not attending, instead sending Foreign Minister Sergey Lavrov, who is expected to hold talks with U.S. Secretary of State John Kerry.
Notable absentees from the nuclear summit are North Korea and Iran.