The Latest: Obama says NATO must stand firm against Russia

WARSAW, Poland - The Latest on President Barack Obama's trip to Warsaw to meet with European leaders : President Barack Obama is calling on NATO to stand firm against Russia, terrorism and other challenges even as a key member retrenches from Europe. In an op-ed published in the Financial Times on Friday, Obama says the U.S. and European nation "must summon the political will, and make concrete commitments" to affirm European cooperation.

EU warns Britain on life after Brexit

Britain got its first taste Wednesday of a future outside the EU as Europe's leaders met without premier David Cameron and warned London it must accept EU migrants to win access to the bloc's free trade zone. The heads of government, meeting without a British representative for the first time in 40 years, said in a statement that Britain would be treated as a "third country" with both "rights and obligations".