DONETSK, Ukraine: Multiple explosions were heard on Sunday in the centre of the separatist-held city of Donetsk in eastern Ukraine, a Reuters witness said.
A loudspeaker in the area asked citizens to exercise caution. The origin of the explosions was not clear.
Western allies can't keep offering an olive branch while Russia continues to dial up tensions along the Ukrainian border, European Council President Charles Michel said Sunday.
"The big question remains: does the Kremlin want dialogue?" Michel asked at the Munich Security Conference.
"We cannot forever offer an olive branch while Russia conducts missile tests and continues to amass troops," he added.
A Russian invasion of Ukraine now seems "far more likely than unlikely" and all the signs suggest it is "very, very imminent", Britain's minister for Europe said on Sunday.
"Unfortunately, at the moment, an attack, an invasion seems far more likely than unlikely but we will continue to work to try and avert that," James Cleverly told Sky News.
"Everything that we see indicates that invasion is very, very, highly likely and very, very imminent."
