BRUSSELS—Germany, Poland and Sweden expelled three Russian diplomats in a coordinated retaliation on Monday for the expulsion of three European Union diplomats by Russia while the EU’s foreign policy chief was visiting Moscow last week. The EU executive defended Josep Borrell over his trip to Russia where he said he had learned of the expulsions via social media while speaking with Russian Foreign Minister Sergei Lavrov in Moscow on Friday. Kremlin spokesman Dmitry Peskov said on Monday the removal of diplomats from Germany, Poland, and Sweden, accused by Moscow of taking part in protests last month against jailed Kremlin critic Alexei Navalny, took place a day before Borrell’s trip. In a blog released late on Sunday, Borell said his pleas to Russia to halt the expulsions were ignored. Estonia’s former defence chief Riho Terras, now an EU lawmaker, has started a campaign to call for Borrell’s resignation. But the executive …