HELSINKI, June 18 (Reuters) - Finland will buy GBU-53 SDB II glide bombs from the United States for its F-35 fighter jets, the Nordic country's defence ministry said in a statement on Thursday.

The purchase adds a new air-to-ground capability to NATO-member Finland's F-35 fleet and supplements its $9.4 billion acquisition of 64 F-35 jets from Lockheed Martin.

• The GBU-53 SDB II is a precision-guided glide bomb capable of striking moving targets at medium range in adverse weather conditions, the defence ministry said in a statement.

• Its small size allows multiple SDB II munitions to be carried simultaneously on a single F-35.

• The bombs will be manufactured by Raytheon, a unit of U.S. defence contractor RTX RTX.N.

• The package covers spare parts, documentation, transport, training, repair and support services.

• Defence Minister Antti Hakkanen said the purchase represents a new capability that strengthens Finland's defences "in demanding conditions."