Donald Trump's special envoy will meet Vladimir Putin on Tuesday, following talks between US and Ukrainian officials. The meeting comes as a NATO officer said they could weigh a more assertive response to Russian hybrid warfare.

Matthew Whitaker, the U.S. ambassador to NATO, told the Berlin Security Conference earlier this month that he hoped a German would become Supreme Allied Commander Europe (SACEUR), overseeing the alliance’s military activities in Europe, a role that has been held by an American since NATO’s inception.

The Spanish defense minister has defended the country's commitment to NATO after U.S. President Donald Trump suggested expelling Spain for not spending enough on its military.

President Trump's peace plan became public last month, sparking alarm that it was too favorable to Moscow. It was revised following talks in Geneva between the U.S. and Ukraine a week ago.

Lithuania has intensified its warnings over alleged “airspace violations” after Vice Minister of National Defence Karolis Aleksa reaffirmed claims that balloons launched from Belarus have repeatedly entered Lithuanian territory.

Trump’s hardball tactics have extorted greater allied cooperation and reasserted U.S. domination over the organization.

President Donald Trump said he would formally designate Saudi Arabia as a major non-NATO ally in a further strengthening of ties between the two countries, capping a day of dealmaking between the US leader and the kingdom’s Crown Prince Mohammed bin Salman.

President Trump said Tuesday he will designate Saudi Arabia as a major non-NATO ally, marking a step up in defense ties between the U.S. and the Gulf monarchy.

Trump designated Saudi Arabia a major non-NATO ally during a historic White House dinner with Crown Prince Mohammed bin Salman, marking 80 years of relations.

U.S. Secretary of State Marco Rubio plans to skip a meeting of NATO foreign ministers in Brussels next week, two U.S. officials said, in a highly unusual absence of the top U.S. diplomat from a key transatlantic gathering.