US officials praise UK's commitment to increase defense spending and offer troops for Ukraine peace deal ahead of talks between Keir Starmer and Donald Trump. Starmer appeals for US help in guaranteeing terms of peace deal and to avoid tariffs on UK. Starmer also seeks a state visit invitation from the King to win over Trump. Trump does not seem willing to change course on security guarantees and insists on imposing tariffs on the EU. Starmer is ready to send British troops to Ukraine, but warns that a military 'backstop' from the US is necessary. Starmer's visit is part of a European effort to persuade Trump not to abandon Ukraine and Europe.