Papua New Guinea's recent defence of a landmark US security pact included a message to China that it was business as usual, as the Pacific becomes a new theatre for great power rivalry. The Defence Cooperation Agreement, signed last month, would give US troops unrestricted access to some of PNG's seaports and airports - a move that could potentially bolster the US military's defence of its Guam bases in the Pacific "second island chain". The deal signalled greater presence for the US and a furth