Speaking with one voice
From China through Italy to the US, XXX customers all over the world will be familiar with the above key facts about their supplier’s products. A wide range of communication and marketing activities will help us get the message across in the months to come,” concludes YYY.

Заранее благодарю.

to be at one with sb's view: e.g. Tony Blair is at one with the American view. - полное совпадение взглядов
to speak with one voice
to act as one
И даже, но это уже из другой оперы:
to feel at one with sth.: e.g. to feel at one with one's work