TAIPEI, Aug 12 (Reuters) - Taiwan Vice President William Lai leaves on Saturday for a sensitive trip to the United States, which China has condemned and Taiwanese officials fear could prompt more Chinese military activity around the democratically governed island.

Lai, the front-runner to become Taiwan's president in elections in January, is officially making only transit stops in the United States on his way to and from Paraguay for the swearing in of its president.

Taipei and Washington say such stopovers are routine and no cause for China to take "provocative" actions, but Beijing has reacted with anger at what it sees as a further sign of U.S. support for Taiwan, which it claims as sovereign Chinese territory.

China is likely to launch military drills next week near Taiwan, using Lai's stopovers in the United States as a pretext to intimidate voters ahead of a next year's election and make them "fear war", Taiwanese officials say.

Beijing particularly dislikes Lai, who has in the past described himself as a "practical worker for Taiwan independence". Lai has, however, repeatedly said during the election campaign he does not seek to change the status quo.

Lai, who goes first to New York, published a short video on his social media accounts late on Friday about his trip, mentioning only the Paraguay part, the country being one of just 13 to maintain formal ties with Taipei.

He showed off what he will be taking with him, including the gift of a Garmin solar-powered GPS bike computer for Paraguay's new president, Santiago Pena, as well as neck cushions and baggage tags emblazoned with words including "Team Taiwan" in English and "Taiwan, your backer" in Chinese.

"I hope, by serving as President Tsai Ing-wen's special envoy to Paraguay to participate in the inauguration ceremony of the new president, to convey the blessings of the people of Taiwan," he said.

Neither Taiwan nor the United States have given exact details about his U.S. schedule.

The U.S. State Department told Reuters that, consistent with past transits, Lai would meet the chair of the Virginia-based American Institute in Taiwan, a U.S. government-run non-profit that carries out unofficial relations with Taiwan.

Lai, scheduled to speak to reporters at Taiwan's main international airport on Saturday afternoon before leaving, is to return from Paraguay via San Francisco.

The Paraguay leg of the trip is also important given China's increasing efforts to take Taiwan's remaining allies.