US President Joe Biden and Russian President Vladimir Putin have agreed in principle to a summit over Ukraine, the French leader said on Monday, offering a possible path out of one of the most dangerous European crises in decades.

Financial markets edged higher on the glimmer of hope for a diplomatic solution even as satellite imagery appeared to show Russian deployments closer to Ukraine's border and sounds of fighting were heard on Monday in the east, where Ukrainian government forces are fighting pro-Russian separatists.

The office of French President Emmanuel Macron said...