The impeachment case against former U.S. President Donald Trump is underway. European Union (EU)'s top diplomat Josep Borrell is expected to meet Russian Foreign Minister Sergei Lavrov in Moscow from February 4 to 6.

Trump impeachment underway

Former President Donald Trump's impeachment trial in the U.S. Senate will start in the week beginning February 8.

Read more:

Why impeach Trump when his term ends in a week?

Senators were sworn in as jurors on Wednesday and a summon has been sent by the Senate to the former president, requiring him to answer the article of impeachment.

The House impeachment managers will submit their pretrial brief on February 2, when Trump's defense team also needs to file its response to the charge.

The trial is scheduled to unfold as follows for the next few days:

February 2: Trump's answer to article of impeachment due, House' pretrial brief due

February 8: Trump's pretrial brief due

February 9: House's pretrial rebuttal brief due (trial can begin)

EU's top diplomat to visit Russia

High Representative of the EU for Foreign Affairs and Security Policy Josep Borrell will pay a working visit to Moscow on February 4 to 6, amid Russian opposition leader Alexei Navalny's case.

The EU has called for releasing Navalny while Russia reiterated that the case is a purely domestic affair and foreign intervention is not allowed.

When asked if he would make his trip conditional on meeting Navalny, Borrell said, "You don't do things this way."

"This is a good moment to reach out and talk to Russian authorities," Borrell said.

According to Russian Foreign Ministry, Foreign Minister Sergei Lavrov will meet Borrell and they will discuss "the entire range of problems and prospects of Russian-EU relations."

Both sides will exchange views on the situation in the Western Balkans, the Middle East and North Africa, and the region of the Commonwealth of Independent States.

They will also discuss the prospect of the implementation of the Iran nuclear deal, the situation in Nagorno-Karabakh and security issues in Europe.

Day by day:

Monday: A quite day in politics

Tuesday: Russian Foreign Minister Sergei Lavrov holds talks with Swedish counterpart Ann Linde in Moscow; due date for former U.S. President Donald Trump to answer the article of impeachment against him; due date for U.S. House of Representative to submit pre-trial brief of impeachment against Trump

Wednesday: Lavrov holds talks with his Jordanian counterpart Ayman Safadi

Thursday: High Representative of the EU for Foreign Affairs and Security Policy Josep Borrell visits Moscow and holds talk with Lavrov (to February 6); European Commission conference on competition policy and the EU Green Deal

Friday: Borrell continues his Moscow visit 

Saturday: International Day of Zero Tolerance to Female Genital Mutilation

Sunday: Ecuadorian National Congress election; Ecuador presidential election

(With input from agencies)