Russia urged Tajikistan and Afghanistan to resolve any dispute in a mutually acceptable manner, saying it had heard reports they were sending troops to their common border, TASS quoted the Russian foreign ministry as saying on Thursday.
"We observe with concern the growing tensions in Tajik-Afghan relations amid mutually strong statements by the leadership of the two countries," TASS quoted ministry spokesperson Alexei Zaitsev as saying.
According to the Taliban's own information, tens of thousands of special forces fighters have been deployed in the Takhar province of northeastern Afghanistan, adjacent to Tajikistan, he said.
Tajikistan's foreign ministry and Taliban spokesmen were not immediately available for comment on the reports.
Also read: PM Imran, President Rahmon to bring Taliban, Tajiks closer: Fawad
Tajik President Emomali Rakhmon has refused to recognise the Taliban-appointed cabinet in Kabul and lashed out at what he described as violations of human rights in the Taliban's siege of the Panjshir province.
The Taliban, in turn, warned Dushanbe against meddling in Afghanistan's domestic affairs. Ethnic Tajiks make up more than a quarter of Afghanistan's population, but Taliban members predominantly belong to the biggest ethnic group, Pashtuns.
Tajikistan, which hosts a Russian military base, held military parades in two border provinces on Wednesday and Thursday.
US Defence Secretary Lloyd Austin expressed concern on Wednesday for US-trained Afghan pilots and other personnel being held in Tajikistan after fleeing across the border from Afghanistan last month as the Taliban took power.
In the war's final moments, the US-backed Afghan Air Force personnel flew dozens of military aircraft across the Afghan border to Tajikistan and Uzbekistan and were detained there.
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