Belarus said on Tuesday that there was a significant grouping of Ukrainian troops massed near its border and warned that this posed a threat to its security.
"At present, a significant grouping of the Ukrainian army is concentrated in the immediate vicinity of the Belarusian-Ukrainian section of the state border," the defence ministry said in a post on Telegram.
"The probability of armed provocations, which can escalate into border incidents, has been high for a long time," it said.
Reuters was unable to immediately verify the situation at the border.