Chinese Foreign Minister Wang Yi blamed the United States and its allies for containing China, and said Pacific island nations were not anyone's "backyard" as he continued his tour of the region.
In a meeting with Kiribati President Taneti Maamau on Friday, Wang said China was willing to support developing nations.
"The world is not peaceful, the epidemic is raging, wars are frequent and poverty and backwardness can be seen everywhere. But the United States and its allies are determined to focus on deliberately hindering China's development," Wang was quoted as saying by a Chinese foreign ministry statement.
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"China is willing to do its best to work with developing countries to accelerate common development and eliminate injustice."
The Global Times, an English-language tabloid published by the ruling Communist Party's official People's Daily, reported that a road map for infrastructure construction under China's Belt and Road Initiative had been signed, along with cooperation agreements on trade, renewable energy and customs.
Wang started his 10-day tour on Thursday, making his first stop in the Solomon Islands. He will travel to Samoa, Fiji, Tonga, Vanuatu and Papua New Guinea and hold virtual talks with the Cook Islands, Niue and the Federated States of Micronesia. He will also visit East Timor.
Following a meeting with his Solomons counterpart Jeremiah Manele, Wang said all Pacific island nations had the right to decide what deals to sign.
"Pacific island countries are all sovereign and independent countries, not someone's 'backyard'. They all have the right to make their own choices, rather than being the subordinate of others," Wang said.
Wang added that any smear attack on the security cooperation between China and Solomon Islands would not succeed.
Beijing is seeking a robust security presence in the region, with proposals to train Pacific police officers, team up on "traditional and non-traditional security" and expand law enforcement cooperation, according to a leaked draft of the proposed agreement seen by Associated Press.
China had already sealed a security pact with the Solomons but the absence of publicly released details has stirred concerns over whether the pact would permit a Chinese naval deployment.