<h1>Transatlantic relations face erosion from executive territorial and tariff threats, prompting allies to seek independent security and trade arrangements</h1> Executive threats to seize foreign territory and to impose tariffs have destabilised long-standing interstate alliances by undermining mutual trust and prompting partners to pursue independent security and trade strategies; this has produced concrete shifts such as expedited bilateral trade deals, conditional suspension or delay of multilateral agreements, and increased emphasis on strategic autonomy, thereby complicating any future executives ability to restore predictable diplomatic and commercial cooperation and increasing the likelihood that allies will seek arrangements that do not depend on singular electoral cycles.