Micronesia's outgoing President, David Panuelo, has accused China of "political warfare" and nefarious tactics, including offering bribes and spying, with an aim to ensure alignment with China in the event of a war with Taiwan.
President Panuelo also discussed switching diplomatic allegiance from China to Taiwan in exchange for $50 million in aid.
He sent a 13-page letter to other national leaders, state governors, and political leaders of the Pacific nation.
In the letter obtained by the Associated Press, Panuelo made an unusually frank assessment of China's motives in the region and the financial incentives for smaller countries to switch diplomatic allegiance.
Should Micronesia switch allegiance to Taiwan, it would represent a rare win for the self-governing island after several Pacific nations switched allegiance from Taiwan to China in recent years.
However, The Independent reported that President Panuelo also claimed that Chinese agents threatened him when he considered switching diplomatic ties to Taiwan and tried to bribe senior officials with envelopes of cash.
He has accused Chinese officials of carrying out clandestine intelligence operations in Micronesia and compromising national security to further China's interests.
In contrast, The Times reported that President Panuelo made the allegations in a 13-page letter to his nation's congress after his election defeat, in which he claimed that Chinese officials had interfered in his government's affairs and compromised national security further conflict with China.
"One of the reasons that China's political warfare is successful in so many arenas is that we are bribed to be complicit; bribed to be silent," he wrote.