There was an increase in Indian economic and military co-operation with Iran during the 1970s.

China has traditionally had strong ties with Burma, revealed in ever-bigger trade deals and greater military co-operation.

There were distinct signs of German military and diplomatic co-operation with the Italians.

During his tenure he visited China due to the military co-operation between the two nations.

China has a close relationship with Sudan and increased its military co-operation with the government in early 2007.

But laudatory words in the early 1940s were not followed by military co-operation.

In early 1939 there were distinct signs of German military and diplomatic co-operation with the Italians.

The embargo on arms deliveries to China and the ban on military co-operation remained in force.

That is how I understand the answer and it thus means a major move from free alliances to participation in a joint military or European co-operation.

Finland accepted, weapon deals were made and military co-operation began in December 1940.