SYDNEY: China cautioned Papua New Guinea against “undermining” its interests and sovereignty in signing a mutual defense pact with Australia widely seen as a counter to Beijing’s growing influence in the Pacific. Australia and Papua New Guinea this week agreed on the text of a deal which will see the countries commit to defending each other from armed attacks. Asked about the deal, a spokesperson for Beijing’s embassy in Port Moresby said China respected Papua New Guinea’s right to strike deals with other countries.