First EU reaction to UK decision expected on Friday morning. Spain to hold elections on Sunday that could bring maverick left-wingers Podemos to power.
The EU commission said there is systemic threat to rule of law in Poland and gave new ultimatum. Poland said commission is "losing its authority".
The German chancellor faces mounting criticism at home for her refugee policy after asylum seekers carried out several attacks over the last week.
Officials already preparing for aftermath of Brexit referendum, but this week EU institutions will focus on migration as Commission unveils ideas on what to do overseas.
The European Commission could adopt a critical report on the rule law in Poland. While EU ministers will talk about urban policies, agriculture and education, MEPs will debate migration policies.
Busy week ahead in Brussels with five council meetings, a Eurogroup and the European Parliament's plenary on the agenda .
Eurozone finance ministers will try to find an agreement on Greek bailout and the EU Parliament will set out its positions on asylum, Schengen and Turkey.
The EU commission will present its report on visa liberalisation for Turkey and its economic forecasts, and pope Francis will receive the most prestigious European award.
Antoine Deltour, who revealed details of Luxembourg's tax deals with multinational firms, goes on trial. Meanwhile, the TTIP trade deal enters its 13th round of negotiations.
A month after the European Union and Turkey agreed on the details of a plan to stem the flow of migrants, the implementation of that plan will be discussed in the EU structures this week.
Panama Papers revelations, that could topple the Maltese government, will be debated in the EP next week. Controversial legislation to share passenger name records will also be voted on.
Big week to see start of EU migrant returns to Turkey, sensitive talks in Poland on judicial reform, and a Dutch referendum on EU relations masquerading as a vote on Ukraine.
Another EU summit will try to agree on the plan proposed by Turkey to take refugees in exchange for more help, while the Commission will present its proposal to overhaul the asylum system.
The EU's tentative efforts to address the refugee crisis will dominate the news, while the Spanish socialist leader Pedro Sanchez will try to get the parliament's approval to become prime minister.
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Relations with Britain and migration are set to dominate next week as EU leaders gather in Brussels for a two-day summit.
Diplomats and EU offficials will be busy preparing next week's EU summit on British reform demands and migration.
A draft proposal answering British demands for EU reform is expected. At the EU Parliament plenary session, migration, Turkey, diesel car and data protection will be on the agenda.
Migration will still be top the agenda when home affairs ministers hold their first meeting this year. Manwhile the EU Court of Auditors will publish a report on the management of aid plans to countries in difficulty.
EP to hold debate on Polish government's constitutional and media "coup". Dutch PM Rutte to outline views on migrant crisis, MEPs to also put together VW inquest team.
The commission will present a project for an EU border guard corps, leaders will discuss UK demands to stay in the EU and Spain will vote for a new parliament.
The Paris climate conference will try to set binding carbon emissions targets, while Denmark will vote on EU justice policy.
Fellow euro states, at a ministers’ meeting in Brussels on Monday, are expected to disburse the next tranche in the Greek bailout.
EU leaders to hold two summits on migration as winter approaches, with a Turkey deal key to slowing arrivals. UK also expected to unveil wish list for EU reforms.
The asylum and refugee crisis continues to dominate this four-day WEEK as the European Commission marks its one-year anniversary under Jean-Claude Juncker.
A lack of unified response from EU member states on how best to tackle the influx of refugee and asylum seekers will dominate the debates this week.
MIgration will top the agenda of the EPP congress in Madrid, while Poland will vote on Sunday to elect a new government.
The Turkish president, the king of Spain, and German and French leaders to visit EU institutions. EU Court to also rule on Facebook's handling of personal data.
Prospects of an EU-US-Russia alliance against Islamic State (IS) and a peace deal on Ukraine take centre stage this week.