The Globe and Mail add these details:

[The Ukrainian government] said two minivans arrived at the border as if about to leave Ukraine at the Izvarino crossing point in the eastern region of Luhansk, a hotbed of pro-Russian insurgency. The men jumped out of the vehicles, surrounded the post, pointed their rifles and demanded guards lay down their weapons.



The border guards refused and opened fire, the assailants replying with gas bombs. The attack ended with the men fleeing. The Border Guard office said steps were being taken to reinforce the post.

