Dwarfed by its Communist neighbor and still bearing the scars of a war with the U.S. four decades ago, Vietnam has become a focal point of the race between the two powers for influence in the western Pacific. The tussle over Vietnam will be on display during a three-day visit next week by President Barack Obama. The third sitting U.S. president to travel to the country since the end of the war, Obama is expected to meet with the regime’s top leaders on Monday. The trip to Hanoi and Ho Chi Minh City is part of U.S. efforts to preserve clout as China expands its economic and military influence across Asia and argues with countries like Vietnam over territory in the South China Sea. For its part, Vietnam will be seeking the full lifting of a U.S. weapons sales ban, more aid to clean up a dioxin used as a defoliant during the war and unexploded ordnance, and reassurances a U.S.-led Pacific trade pact will make it through Congress. “There is a new mood in Vietnam in how it looks at America,” said Nguyen Manh Hung, professor emeritus at George Mason University in Virginia.  “It is less suspicious. His visit is very important to the Vietnamese for symbolic reasons.” TPP Doubts Obama’s visit comes 21 years after then-President Bill Clinton normalized ties with Vietnam and a few months after the U.S., Vietnam and ten other nations signed the Trans-Pacific Partnership, whose fate remains unclear amid criticism of the pact in the U.S. Senate and from presidential candidates. Vietnam, whose economy grew 6.68 percent last year, the most since 2008, seeks increased trade with the U.S. through the TPP to boost exports and reduce its economic dependence on China. “When you look at Southeast Asia and what relationships where we’ve seen the most progress occur, Vietnam is really at the top of that list,” said Meredith Miller, a former official at the State Department’s Bureau of East Asia and Pacific Affairs. “What they can hope to hear from President Obama is that he’s doing absolutely everything in his power to see the agreement approved in a lame duck session before the next administration takes office.” They may be Communist neighbors, but Vietnam and China have a long history of tensions. The countries fought a brief border war in 1979 and relations ruptured in the summer of 2014 after a Chinese oil rig was placed off Vietnam’s coast in the disputed Paracel islands. China, Vietnam’s largest trading partner, has angered Hanoi by flying planes on a new airstrip on islands it reclaimed in the disputed Spratly area. Hague Case The U.S., which is not a claimant in the South China Sea, has criticized China’s actions over territory. An arbitration court in the Hague is set to decide on a Philippine challenge to China’s claims to more than 80 percent of the South China Sea, probably by mid-year, even as China declines to take part in that case. Vietnam says it welcomes the U.S. presence in the region, though it is careful not to be pulled too far into its orbit. It still wants ties with its powerful neighbor and to avoid outside interference in its political system, said Hung, who describes U.S.-Vietnam relations as a “hesitant tango.” Arms Embargo Vietnamese leaders have long pushed for a full lifting of the weapons ban and Defense Secretary Ash Carter said last month he supported eliminating limits on lethal weapons sales. The U.S. partially lifted its embargo in 2014 and has hosted two defense contractor symposiums in Hanoi, the most recent May 11-13, which was attended by companies such as Boeing Co. and Lockheed Martin Corp. “We have not finalized a decision with regards to this issue,” Ben Rhodes, deputy national security adviser at the White House, said during a call with reporters. “We fully expect it will be a subject of discussion.” The U.S. is already providing Vietnam with six patrol boats, part of an $18 million military aid package. But conditions remain that could hinder efforts to sell weapons systems to Vietnam, whose human rights record has been criticized by members of Congress, said Carlyle Thayer, an emeritus professor at the Australian Defence Force Academy in Canberra. More than 100 dissidents are detained in Vietnam, according to Human Rights Watch. Dead Fish Obama’s visit coincides with a rise in dissent, and rare public protests, in the country. Vietnamese in recent weeks have taken to the streets in their thousands over the deaths of millions of fish near the central Vietnam-located Formosa Ha Tinh Steel Corp., a unit of Taiwan’s Formosa Plastics Corp. Prime Minister Nguyen Xuan Phuc ordered a probe of how the steel plant received approval to pipe waste water directly into the sea. Police used force to break up some demonstrations May 8 and will be under pressure to ensure there’s no violence when Obama is there, said Le Hong Hiep, a visiting fellow at the Institute of Southeast Asian Studies in Singapore. The government also holds its once-in-five years National Assembly election for 500 seats on Sunday, and is “determined to prevent hostile and reactionary forces from damaging the election,” according to a statement on the parliament’s website Wednesday. “The protesters will take this opportunity to publicize their cause and send a message to the U.S.,” Hiep said. “The Vietnamese government has different tactics they can use—block Facebook, occupy public venues to block demonstrations.” Still, the U.S. administration will be seeking ways to build ties without the overhang of tensions over human rights. “The impression in Washington is that Vietnam takes a very strategic view toward the region,” said Aaron Connelly, a research fellow at the Lowy Institute for International Policy in Sydney. “Washington sees Hanoi as a capable partner. ” Vietnam’s economy is growing rapidly but more reforms are needed, Wally Adeyemo, White House deputy national security adviser for international economics, said in an interview. “Having the president going to Vietnam at this point gives him the ability to go there and celebrate the progress they’ve made but also push them to make additional progress in terms of opening up their economy to foreign direct investment, reforming their SOEs, providing for the education of their populace.”