These are 10 faces Europe will be watching in 2017:
Trump's dim view of bankrolling NATO and his call for better ties with Russia have the EU looking to home-grown defense options.
Poland is the heavyweight leader of ex-communist eastern states. British diplomats are ready to play on the east-west divide in Brexit talks. Moscow is courting old Soviet allies but faces a hurdle in Kaczynski, who sees its hand in the 2010 plane crash in Russia that killed the Polish president - his identical twin.
Europe will look to see how an EU founder member handles a man who wants to quit it: do they circle the mainstream wagons to keep him out of power, enhancing his maverick appeal; or let him in, to temper his rhetoric with the reality of government?
Keeping a poker face, she must unify her government and a country so split that bits threaten to break away -- and then wrangle with Europeans who fear any inch they give may drive another nail into a Union where many may be tempted to emulate any sweetheart deal for London.
MARINE LE PEN
Yet after Brexit and Trump, no one trust the polls. And the 48-year-old has won over millions who never voted for Le Pen Snr's overt racism and anti-Semitism. Much may depend on who she faces in the runoff. If she takes over the nation that invented the EU, it may be the end of the Union, at least as we know it.
THE AFRICAN MIGRANT
By July 31, EU leaders must renew or scrap sanctions imposed to make Putin blink over Ukraine but which some member states dislike. If Trump breaks ranks by easing U.S. sanctions, the EU will struggle to prevent one or more members blocking renewal.
Italy's euro zone partners are watching the heavily indebted state and its ailing banks with unease. Unlike Greece, say, or Portugal, Italy is both too big to fail, and too big to save.
The 62-year-old physicist from East Germany is a guarantor of her country's long-standing attachment to the EU as the key to a stable Europe after havoc wrought from Berlin last century. But can she work miracles if her neighbours start falling apart?
THE MAN IN BLACK