Amid a worsening refugee crisis, European Union leaders were due Wednesday to open a two-day summit with African partners aimed at finding ways of stemming migration flows into the bloc, dpa reported. "We are under incredible pressure of events," EU President Donald Tusk warned on the eve of the meeting in the Maltese capital Valletta, which was expected to be attended by more than 60 African and European leaders. "EU governments are reviewing over a million asylum applications between them, an all-time record number that would test any developed democracy," the former Polish prime minister said in a speech to the Maltese parliament. Even though most EU-bound refugees hail from Syria, Afghanistan and Iraq, and enter via Greece and the Western Balkans, stemming migration flows from Africa is also an important priority for the 28-member bloc.