Behind an unmarked white door on a graffitied backstreet in Sarajevo, a company with no discernible track record in large-scale infrastructure is reported to be on the verge of winning contracts worth more than one billion dollars. AAFS Infrastructure and Energy is understood to be close to securing a concession that would allow it to build and operate a pipeline carrying American liquefied natural gas across the Balkans, effectively displacing Russian supply. Senior Bosnian officials, who have asked not to be named given the sensitivity of ongoing negotiations, have described the project as potentially the most consequential piece of infrastructure their country has ever undertaken. What the company appears to lack in experience, it may compensate for in political proximity. Two of its principal representatives are said to maintain close personal ties to Donald Trump: one is a Washington lawyer who has represented members of the Trump family in politically sensitive litigation, while the other is the brother of a former national security adviser. Both individuals are reported to have played roles in efforts to challenge the outcome of the 2020 presidential election, a cause long associated with Trump himself. A Guardian investigation, drawing on leaked documents, corporate records and interviews with current and former officials on both sides of the Atlantic, has sought to trace how a company of such limited profile came to occupy so prominent a position in the global contest over energy supply. The picture that emerges is one in which the conventional boundary between state policy and private enrichment appears to have become substantially blurred. One former senior American official with regional experience suggested that, however distasteful such arrangements might seem, they have acquired a certain transactional logic under the current administration. The geopolitical stakes are considerable.…