The United States' annual message to Serbia to mark its national day made no mention of the country's bid to join the European Union, which Washington has previously supported.
US Secretary of State Rex Tillerson on Monday issued a short statement to extend to Serbia his best wishes and hopes for "a prosperous future," two days ahead of its national day.
But the wording of the statement underlines the extent to which President Donald Trump's new US administration has moved on from its predecessor's support for the European Union.
And it may cheer Russian President Vladimir Putin's Kremlin, which resents Europe's eastward march and is seeking to retain Moscow's historically strong influence in Serbia and the broader Balkans.
In this week's letter, Tillerson hailed "Serbia's continued efforts to promote economic reform, to further strengthen the rule of law and to improve relations with its neighbors," which he described as cornerstones of "regional stability and economic growth."
But he made no mention of Serbia's recent bid to join the European Union or of what the State Department has often previously referred to as its "Euro-Atlantic aspirations."
Last year on the same day, by contrast, former president Barack Obama's secretary of state John Kerry underlined US support for Serbia's EU entry in the clearest of terms.
"We applaud Serbia's commitment to the EU accession process and related reforms," Kerry wrote in February 2016.
"The hard work of adopting EU norms and standards will lead to a more prosperous, democratic Serbia that is more fully integrated into Euro-Atlantic institutions."
The State Department would not issue a statement in support on Serbia's EU ambition but, speaking on condition of anonymity six hours after Tillerson's statement, one official insisted the policy had not changed.
"The United States remains fully supportive of Serbia’s European Union accession efforts," he insisted.
"We continue to appreciate our close and cooperative security relationship with Serbia, as well as Serbia’s growing partnership with NATO."
Obama's administration was a vocal supporter of Brussels' outreach to the countries of Central and Eastern Europe, believing EU membership would bind former Soviet satellites more firmly to the West.
But Trump has been scornful of the European Union and multilateral treaties in general, and has even been cool on the future role of the traditionally US-led NATO military alliance.
Serbia officially applied to join the European Union in December 2009 and began negotiations to do so in 2014, despite the skepticism of a significant proportion of its own population.
Westward-leaning Serbs see joining the 28-nation bloc as a guarantor of stability and prosperity in a region still reeling from both the recent financial crisis and the 1990s Balkan wars.
But many nationalists nurse resentment over the collapse of Yugoslavia and the NATO bombing of Serb targets during the Bosnian and Kosovo wars -- and some see Putin's Russia as a natural ally.
Trump has repeatedly said that he, too, would like Washington to enjoy friendlier ties with Moscow.