"What have you been able to do through diplomatic channels?"

Oh, don't try to contact him through any diplomatic channels.

He had sought this through diplomatic channels for a number of years with no success.

What followed were a series of meetings that took place outside formal diplomatic channels.

But China already knows through diplomatic channels what moves would be most welcome.

"Things I would prefer did not get into either diplomatic or military channels."

"The two countries should work out their problems through diplomatic channels," he said.

Both parties agree that any new agreement must be reached through diplomatic channels.

The two leaders have been in communication through regular diplomatic channels.

As a result, official diplomatic channels were closed to Nelson.