Greece takes over the six-month rotating presidency of the Council of the EU. The presidency’s four priorities are growth, jobs and cohesion; further integration of the EU and the euro area; migration, borders and mobility and maritime policies.
Latvia adopts the euro as its currency, becoming the 18th member of the euro area.
Rīga (Latvia) and Umeå (Sweden) become the 'European Capitals of Culture' for 2014.
EU foreign ministers suspend certain EU sanctions against Iran, following the internationally-agreed action plan aimed at addressing concerns about that country's nuclear programme.
Vítor Manuel da Silva Caldeira is re-elected President of the European Court of Auditors for a third three-year term.
At a summit in Brussels, EU and Russian leaders discuss the Eastern Partnership and the fight against terrorism.
The Commission unveils its first anti-corruption report explaining the situation in each Member State.
The President of Ukraine is ousted by the Parliament after several months of popular protest. The country's relationship with the European Union and with Russia is at the heart of a period of uncertainty.
EU foreign ministers strongly condemn the referendum which was held in Crimea, Ukraine, by groups who want the region to become a part of Russia. The EU does not recognise the illegal annexation of Crimea. EU sanctions are imposed against persons in Russia responsible for undermining the territorial integrity of Ukraine.
Meeting in the European Council, EU leaders discuss the crisis in the Ukraine and also address economic issues, industrial competitiveness, climate and energy.
At a summit in Brussels, EU leaders and US President Barack Obama discuss international foreign policy, the crisis in Ukraine and key global challenges.
The European Parliament adopts a set of rulebooks on how to deal with banks in serious difficulties, so that taxpayers no longer have to pay for failing banks. This is the final element of the EU’s Banking Union. MEPs also pass a new law guaranteeing EU residents the right to open a basic payment account.
Ahead of this year's European elections, political parties for the first time nominate their candidates for the post of European Commission President, and the candidates engage in 'presidential debates'.
European elections take place across the EU and 751 MEPs are elected. Total turnout is 43.09%.
Presidential elections are held in Ukraine amid continued unrest in the eastern part of the country. The winner, Petro Poroshenko, wants to cooperate with the EU.