Summarize this text in 4 sentences each with in 100 characters:-  President NAME_1 and British Prime Minister NAME_2 announced on Thursday a new economic agreement between the two nations and vowed to continue supporting Ukraine during their first joint appearance at the White House since the United Kingdom leader took office. The agreement, called the Atlantic Declaration, will strengthen economic ties between the two longtime allies across a number of industries, including the defense, health care and energy sectors, while boosting investment in technology and other areas. NAME_3 framed the accord as a symbol of the renewed partnership between Britain and the United States following a turbulent decade punctuated by Britain's exit from the European Union, arguing that a strong relationship between the two nations was critical for global stability. Judge NAME_4 by our actions after the Brexit deal, NAME_3 said. The United Kingdom remains as attractive an investment destination as ever for partners like the United States, he added. NAME_5, appearing with NAME_3 at a joint press conference, called Britain a key ally of the United States There's no issue of global importance, none, that our nations are not leading together, NAME_5 said. The president said the Atlantic Declaration's focus on research and investment in emerging technologies like artificial intelligence would help both countries adapt to changes in the global economy. The deal will help the United States and UK remain at the cutting edge of a rapidly changing world, NAME_5 said. NAME_5 also praised NAME_3 for his nation's support of Ukraine since Russia launched its invasion in February, 2022. The United Kingdom has provided more military aid to Ukraine than any other country besides the United States, NAME_3 said. The British leader also issued a stark warning to Russian President NAME_6 NAME_7, saying that the Western coalition backing Ukraine would not waiver. There's no point in trying to wait NAME_4 out. We're not going anywhere. We'll be here as long as it takes, NAME_3 said. Earlier this year NAME_3 joined leaders in Europe in pushing the United States to allow allies to send American-made F-16 fighter jets to Ukraine. The NAME_5 administration had hesitated for months to take the step, citing concerns that it could escalate tensions with Moscow. But NAME_5 changed course last month and announced at the Group of Seven (G7) nations summit that the United States would allow allies to send F-16s to Ukraine. Britain does not have any F-16s, but NAME_3 said at the 