EU warns ‘spark’ could set off escalation at Ukraine borders

A woman waves a European Union flag in front of Russian Embassy in Prague, Czech Republic, Sunday, April 18, 2021. Czech Republic is expelling 18 diplomats identified as spies over a 2014 ammunition depot explosion. On Saturday, Prime Minister Andrej Babis said the Czech spy agencies provided clear evidence about the involvement of Russian military agents in the massive explosion that killed two people. (AP Photo/Petr David Josek)

BRUSSELS — The European Union’s foreign policy chief said Monday that in the face of the big military buildup of Russian troops near Ukraine’s borders, it will only take “a spark” to set off a confrontation.