WASHINGTON (AP) — Succumbing to months of pressure from the United States, several allied nations have taken custody of a few dozen foreign fighters detained in Syria and brought them home to face justice.

Macedonia became the latest country to repatriate detainees captured on the battlefield by U.S.-backed Syrian Democratic Forces, taking seven Islamic State fighters on Monday. The numbers are just a fraction of the roughly 600 foreign fighters currently being detained by the SDF.

The U.S. hasn't publicly discussed many of the previous transfers, saying it is up to the home country to reveal any repatriation of detainees from Syria. But Navy Cdr. Sean Robertson, a Pentagon spokesman, said the total so far this year is "a couple dozen."

According to Pentagon spokesman, Eric Pahon, Macedonia's move to accept the seven fighters "marks a significant milestone in the much-needed cooperative effort to combat the global threat of terrorism," and sets an important example for other coalition members to follow.

The SDF turned the detainees over to Macedonia in Syria, and transportation out of Syria was likely provided by the U.S.

U.S. Defense Secretary Jim Mattis in February declared that "doing nothing is not an option," and urged reluctant allies during a meeting in Rome to help address the growing crisis by taking responsibility for their own citizens. His pleas, however, got only a lukewarm reception initially.

The SDF is holding thousands of IS detainees, but about 600 are identified as foreign fighters from a number of nations. Last week Lebanese officials said they took custody of eight Islamic State fighters and would put them on trial. And late last month the Justice Department said a Detroit-area man, who had been captured by the SDF, was turned over to the U.S. and charged in federal court with providing support to the Islamic State group.

Macedonia on Tuesday announced it had taken custody of seven suspected foreign fighters for allegedly participating in the wars in Syria and Iraq. The suspects, all Macedonian nationals aged between 23 and 41, will be charged with "participation in a foreign army, police and paramilitary formations," officials there said.

According to earlier Macedonian official estimates, about 130 Macedonian nationals have joined the Islamic State group and participated in wars in Syria. At least a dozen have been killed in fighting.