Ukrainian President Petro Poroshenko expanded a list of sanctions against Russian companies and individuals held responsible for the ex-Soviet state's eastern uprising and for Moscow's annexation of Crimea.
EU president Donald Tusk said he would consider requests by German Chancellor Angela Merkel and others for an emergency summit on migrants and decide later this week.
Hungary plans to build a fence to keep migrants out along part of its border with Romania in addition to the barrier being erected along the frontier with Serbia.
Hungary's populist prime minister called for a massive aid package to be given to countries around war-wracked Syria to help stem the flow of migrants to Europe.
French President Francois Hollande, whose country is carrying out surveillance flights over Syria, said it would be "necessary" to carry out air strikes against Islamic State militants there.
Pope Francis says he has felt "used" by people claiming to be his friend since he became pontiff, in a radio interview touching on the personal side of his papacy.
As Russians voted in local elections set to confirm the ruling party's dominance, the opposition reported mass vote rigging and police stormed the office of independent vote monitors.
Tens of thousands of people marched through London in protest against Britain's refugee policy, with new Labour Party leader Jeremy Corbyn attending in his first political engagement only hours after being elected.
German Chancellor Angela Merkel urged the EU to agree to a proportional distribution of refugees with no limits on actual numbers, going much further than plans unveiled by the European Commission.
Prime Minister David Cameron said that veteran socialist Jeremy Corbyn's election to the Labour leadership made the main opposition party a threat to Britain's national security.
Germany's Interior Minister Thomas de Maiziere said Europe should stop looking on helplessly as "murder" rages on in Syria, as he called on the bloc to review its strategy on the conflict.
Prime Minister Viktor Orban defended Hungarian police against accusations of maltreating refugees, saying the migrants had "rebelled" against Hungarian law.
Ukrainian President Petro Poroshenko accused Russia of challenging the "entire democratic world" by annexing Crimea and allegedly arming separatist rebels in the east of his ex-Soviet state.
Catalan leader Artur Mas kicked off campaigning for a regional election billed as an indirect poll on independence from Spain by urging voters to determine their "political future".