The Nato summit will show China how costly Russian ties could be

US President Joe Biden's participation in the Nato and EU summits in Brussels on March 24 is set to acquire historic importance. It could become a particularly fateful juncture if Nato leaders issue any sort of red line to Russian President Vladimir Putin regarding the war in Ukraine. Nato leaders could also decide to impose a no-fly zone. Ukraine's President Volodymyr Zelenskyy has appealed to the US and EU for such a move, and rallied significant public opinion in those places behind him. Of course, this would be very risky because of the potential to draw Nato into direct conflict…