EU interior ministers were pessimistic on Tuesday about resolving a deadlock over proposed asylum reforms, reducing the likelihood of settling the issue before an EU summit on June 28-29.
US renewables group Invenergy says it has begun arbitration against Poland, claiming it will lose hundreds of millions of dollars after the country reneged on its commitments to build wind farms.
Poland has signed a $4.75 billion (3.8-billion-euro) contract to purchase a US-made Patriot anti-missile system, a move that is likely to irk Russia as East-West tensions rise.
Polish Prime Minister Mateusz Morawiecki and European Commission President Jean-Claude Juncker have held what officials hailed as a "constructive" meeting amid concerns over the rule of law in Poland.
EU President Donald Tusk warns that Poland's right-wing government could try to drive the country out of the EU if it stops being a net recipient of bloc funding.