Border tensions continued into the early 21st century, although the two countries cooperated in other areas.

Since then the two countries have enjoyed good relations in all fields, and cooperate closely.

Many other countries cooperated to some extent and in different ways.

It is unclear whether those countries will cooperate with American investigators.

This works well because the countries concerned have cooperated with the employers and employees.

We need all countries to cooperate, to be on board.

We shall need to step up our efforts over coming weeks, so that these countries also cooperate in starting the dialogue.

Should the country cooperate with the east or choose integration in Europe?

If all wealthy countries cooperated, it would add $38 billion a year to health spending by 2015.

"What we're seeing is a very concrete set of projects in which these two countries are cooperating," an Administration official said.