The post-World-War-II international order is officially finished

How a vacuum gets filled:

Kiev (AFP) - Ukraine said on Friday it had destroyed part of a Russian military convoy that crossed onto its territory in an incursion that has sent cross-border tensions rocketing.

NATO accused Russia of active involvement in the involvement in the "destabilisation" of eastern Ukraine, where pro-Kremlin separatists have been fighting against Kiev for four months.

The two countries have also been wrangling for days over a Russian convoy that Moscow says is carrying aid for besieged rebel-held cities but which Kiev suspects could be a "Trojan horse" to provide military help to the insurgents.

Fears that the border clash could spill into all-out war between Kiev and Moscow sent major share markets tumbling across Europe and the United States.

Ukrainian President Petro Poroshenko told British Prime Minister David Cameron that government artillery had destroyed a "considerable part" of a small military convoy that entered the country, the presidency said in a statement.

"Flexibility and reset" seems to have gone the way of "hope and change."