European Commission president Jean-Claude Juncker has led EU and international tributes to those who those who perished in the London terrorist attacks.
Some local German authorities have decided to block appearances by Turkish ministers.
Italy hosted a meeting of interior ministers from eight European Union countries to strengthen support for Libya.
Some eurozone leaders back the idea of letting some member states push ahead with further integration without the whole bloc following suit.
European Council President Donald Tusk will present the draft Brexit guidelines to the remaining 27 states of the bloc within 48 hours.
European Commission President Jean-Claude Juncker is not worried about other EU countries leaving the bloc.
Trump's top trade adviser has accused Germany of using a "grossly undervalued" euro to gain a competitive advantage.
Prior to his inauguration, Trump declared NATO "obsolete" but has since modified his stance.