Russia has launched what was initially described by President Vladimir Putin as a “special military operation” in Ukraine, with subsequent reports stating that at least 40 people had already died as part of what many world leaders and those in the intelligence community are describing as a full-scale invasion of a sovereign country.

As explosions went off all across Ukraine shortly after Putin essentially declared war on the country, President Joe Biden issued a written statement in which he said Ukraine was facing an “unprovoked and unjustified attack” by Russian military forces. 

“The world will hold Russia accountable,” Biden said.

While the situation continues to develop, we’ve put together a breakdown of what’s happened so far, why it happened in the first place, and what it could mean for the world at large moving forward.