Teri Schultz

Many Danes are rethinking their personal security, and stocking up on emergency supplies, amid unidentified drone appearances. Denmark's leaders warn that Russia is waging a "hybrid war."

NATO countries are warning Russia that they will retaliate -- in unspecified ways -- if the country continues to fly military aircraft in their airspace.

NATO countries are warning Russia that they will retaliate -- in unspecified ways -- if the country continues to fly military aircraft in their airspace.

Russian fighter jets illegally entered Estonian airspace Friday. A senior Estonian official says it's time for NATO forces to consider shooting down the next Russian plane that crosses the line.

Denmark's foreign minister summoned the top U.S. diplomat in the country after it was reported that at least three people with connections to President Trump have been carrying out covert influence operations in Greenland.

President Trump will join European leaders and Ukrainian President Volodymyr Zelenskyy for an emergency virtual summit on Wednesday, ahead of the U.S. president's meeting with Putin on Friday.

European Union leaders have approved a major spending package on defense, where Ukrainian President Volodymyr Zelenskyy — a non-EU leader invited to the summit — received a warm welcome.

Defense Secretary Pete Hegseth is visiting with NATO. Allies were concerned that President Trump talked with Russia's Putin to push for a peace deal with Ukraine without notifying European countries.

President Trump says he will meet President Vladimir Putin in Saudi Arabia, after phone calls with the leaders of Russia and Ukraine to start peace negotiations.

Top Trump administration officials are in Europe this week, with Defense Secretary Pete Hegseth attending his first NATO meeting and Secretary of State Marco Rubio in Paris to discuss Ukraine.