After Russian soldiers found their way into Ukraine "by accident", Canada's delegation to Nato produced this map, and helpfully shared it on Twitter.
"Geography can be tough. Here’s a guide for Russian soldiers who keep getting lost & ‘accidentally’ entering Ukraine," the delegation wrote.
Somewhat confusingly, to Russian eyes anyway, the disputed region of Crimea, which Russia annexed this year to international condemnation, is highlighted as Ukrainian territory.
Moscow denies directly intervening in eastern Ukraine, where pro-Russian separatists have been fighting an insurgency against the government in Kiev.