There are reports of fresh clashes on the border between the Central African Republic (CAR) and Chad.
The clashes come just days after six Chadians and three Russians were killed in fighting at a border post.
For the past few years, Russia has sent soldiers to assist the CAR’s military but it is rare for Moscow to confirm its involvement in the fighting.
The UN mission to the CAR says the situation remains tense, while Chad is sending more forces to the border.
Both countries have called on the UN and the African Union to investigate last week’s incident.