4 US Marines identified in deadly NATO drill crash

Authorities say that four U.S. Marines have been killed when their Osprey aircraft crashed in a Norwegian town in the Arctic Circle during a NATO exercise unrelated to Russia's war in Ukraine.

Biden bans Russian aircrafts from US airspace

"I am announcing that we will join our allies in closing off American airspace to all Russian flights, further isolating Russia and adding an additional squeeze on their economy," President Joe Biden said.

Explainer: Has Russia 'invaded' Ukraine?

When Russian President Vladimir Putin authorized troops to cross Ukraine's border into regions controlled by Russian-backed separatists, the White House initially stopped short of calling it an invasion. But not all invasions are viewed as equal.