Here's the timeline of how Michael Flynn got into legal jeopardy

• Former Trump national security advisor Michael Flynn pleaded guilty to lying to the FBI on Friday.
• The lies came during a voluntary interview with investigators only four days after President Donald Trump was sworn in.
• The false statements concerned events that occurred in December 2016, after Trump had won the election but before he was inaugurated.

National Security Adviser Mike Flynn, and Jared Kushner, senior adviser to President Trump, listen to President Trump during a listening session with cyber security experts in the Roosevelt Room the White House in Washington, DC on Tuesday, Jan. 31, 2017.

Jabin Botsford | The Washington Post | Getty Images

Former Trump national security advisor Michael Flynn , marking a crucial new phase in the investigation with the first criminal charges against a member of Trump's White House administration.

The lies came during a voluntary interview with investigators only four days after President Donald Trump was sworn in, and concerned two instances related to contacts with foreign governments.

The false statements related to events that occurred in December 2016, after Trump had won the election but before he was inaugurated.

The first incident involved the transition team's push to impede a UN Security Council resolution condemning Israeli settlements.

The second was about conversations Flynn had with then Russian Ambassador Sergey Kislyak. Those conversations ended up sparking a series of events that would lead to Flynn's resignation only 24 days into his tenure in the White House.

Here's the full timeline:

UN Security Council resolution

Dec. 21 - Egypt submits UN Security Council resolution 2334 to UN Security Council. The resolution condemns "all measures aimed at altering the demographic composition, character and status of the Palestinian Territory occupied since 1967."

Dec. 22 - A "very senior" member of the president's transition team, later identified by NBC as the president's son-in-law Jared Kushner, directs Flynn to "contact officials from foreign governments, including Russia" to "influence those governments to delay the vote or defeat the resolution."

The resolution being considered at the United Nations Security Council regarding Israel should be vetoed....cont:

Dec. 23 - Kislyak informed Flynn that Russia would not vote against the resolution.

Dec. 28 - UN Security Council Resolution 2334 was adopted.

Adoption of Resolution 2334 (14 yes, 1 abstention - USA) results in sustained applause in the Security Council chamber.

That same day - Trump tweeted that Israel should stay strong: "January 20th is fast approaching!"

We cannot continue to let Israel be treated with such total disdain and disrespect. They used to have a great friend in the U.S., but.......

not anymore. The beginning of the end was the horrible Iran deal, and now this (U.N.)! Stay strong Israel, January 20th is fast approaching!

Russia sanctions

Dec. 28 - President Barack Obama announced sanctions against Russia in response to its interference in the 2016 U.S. presidential election.

Dec. 29 - Flynn calls a "senior official" on the president's transition team, who was not Jared Kushner, to discuss "what, if anything, to communicate" to Kislyak about U.S. sanctions. Immediately after the call, Flynn called Kislyak to request that Russia not "escalate" the situation.

President Obama expels 35 diplomats in Cold War deja vu. As everybody, incl people, will be glad to see the last of this hapless Adm.

Dec. 30 - Russian President Vladimir Putin released a statement indicating that Russia would not retaliate against the U.S. for its sanctions.

Great move on delay (by V. Putin) - I always knew he was very smart!

Dec. 31 - Kislyak called Flynn to tell him that Russia's decision not to retaliate against the U.S. was made in response to Flynn's request.

WATCH: Russia probe now in the White House