Defence Secretary Philip Hammond said Britain and France are "natural partners for defence co-operation" after the Prime Minister announced a series of deals.
Mr Hammond said in a statement:
We have made substantial progress since the Lancaster House Treaty was signed in 2010 and today we have committed ourselves to go further still.
The agreements we have reached at this Summit will improve the inter-operability of our forces, enhance our joint equipment procurement and build on our capacity to support security and stability in places such as Libya, Mali and the Central African Republic.
More top news
Father of drowned Syrian boy Alan Kurdi says he is comforted by impact of his son's death, as hia family is reportedly accepted by Canada.
A year ago the International Court of Justice ruled that Japan's decades-old whale hunt in the Antarctic should stop.
Shadow chancellor John McDonnell has backed a free vote for MPs on the issue.