Biden sure Putin will invade Ukraine, UN says security threat higher than Cold War | TOP POINTS

As tension intensifies between Ukraine and Russia, US President Joe Biden has said he is convinced that Putin will invade Ukraine in the coming days. Here's what you need to know.

In one of the worst post-Cold War crises, Russia wants to stop Kyiv joining NATO and accuses the West of hysteria, saying it has no plans to invade, while the United States and allies are adamant the military build-up continues. Warning sirens blared in Donetsk and Luhansk on Friday after rebel leaders there announced the evacuation of hundreds of thousands of people to Russia.

Here's all you need to know:

Russia's Vladimir Putin has decided to invade Ukraine within days, US President Joe Biden said on Friday after separatists backed by Moscow told civilians to leave breakaway regions on buses, a move the West fears is part of a pretext for an attack.

"We have reason to believe the Russian forces are planning to and intend to attack Ukraine in the coming week, in the coming days," Biden told reporters at the White House, adding that Kyiv would be a target.

"As of this moment, I am convinced that he has made the decision."

Late on Friday, Ukraine's military intelligence said Russian special forces had planted explosives at social infrastructure facilities in Donetsk, and it urged residents to stay at home. The Russian Federal Security Service did not immediately reply to a request for comment.

Citing correspondents on the ground, Russian news agencies later reported that two explosions hit Luhansk, one of the main cities in Ukraine's breakaway People's Republic of Luhansk, and a section of a gas pipeline in the area caught fire.