Britain announced on Wednesday that it had finalized a landmark agreement with Vietnam aimed at curbing illegal migration, calling it the most comprehensive deal Hanoi has ever signed with another country. The pact was sealed in London between British Prime Minister Keir Starmer and Vietnamese Communist Party chief To Lam as part of broader efforts to manage migration and bolster bilateral cooperation. The agreement comes at a time when Starmer’s Labour government faces mounting pressure to reduce the number of undocumented migrants entering the UK, a key issue contributing to its recent slide in opinion polls. Official data shows that Vietnamese nationals made up the largest group among foreign migrants arriving in Britain by small boats from continental Europe in the first half of 2024, accounting for 17% of all such arrivals. In the year ending June 2025, small-boat crossings represented 43,000 of the total 48,000 irregular entries into the UK. The new deal seeks to simplify procedures and expedite the deportation of migrants who have no legal right to remain in the country. “The number of illegal arrivals from Vietnam has already been cut by half, but more can be done,” Starmer said in a statement, emphasizing that international cooperation—not political rhetoric—was the key to solving the crisis. For Vietnam, the agreement reflects To Lam’s growing role in directing foreign policy since assuming the post of party chief last year, expanding Hanoi’s engagement beyond trade to security and migration issues. The joint declaration issued after the meeting also pledged to deepen ties in political trust, economic development, energy, education, and science and technology. The announcement follows a similar deal between Britain and France earlier this year, under which the two countries agreed to exchange undocumented migrants and legitimate asylum seekers with family connections across the Channel. With immigration now ranking among British voters’ top concerns after the cost of living, the Starmer government is under pressure from the populist Reform UK party to deliver quick results on border control, making this deal with Vietnam a crucial political and diplomatic milestone.