Military trainings, sanctions and NATO developments. Here’s what you should know.

The UK government sanctioned a Russian judge and two other individuals it says are connected to the arrest of jailed Kremlin critic Vladimir Kara-Murza.

In response to the move, which involves asset freezes and a travel ban, former Russian President and deputy chair of Russia’s Security Council, Dmitry Medvedev, called Britain ”our eternal enemy.”

“Who gives a damn about their decisions? Britain has been and always will be our eternal enemy, at least until their arrogant and miserably damp island is swept into the murky depths of the sea by a wave created by a state-of-the-art Russian arms system,” Medvedev wrote on Telegram Friday.

Here are other headlines you should know:

Calls for aid: Ukraine’s foreign minister asked the EU to expedite more aid one week after the European Union approved a fund of approximately $1.1 billion to reimburse states that have sent ammunition to Ukraine. Dmytro Kuleba said he called on EU’s foreign policy chief, Josep Borrell, ”to help finalise discussions on the 2nd €1 billion ($1.12 billion) joint procurement tranche as soon as possible to ensure security in Europe.”

NATO developments: Ukraine has received a ”green light” for close cooperation with NATO’s Support and Procurement Agency (NSPA), Ukraine’s Defense Minister Oleksii Reznikov said Friday. Reznikov’s comments come on the heels of Stoltenberg’s remarks, reaffirming that Ukraine will eventually ”become a NATO member.” The Russian Foreign Ministry issued a warning Friday about NATO’s ”dangerous” statements regarding Ukraine joining the alliance. 

Military training: The US will begin training Ukrainian forces on how to operate Abrams tanks next month as it seeks to get them onto the battlefield against Russia before the end of the summer. US M1A1 Abrams tanks will be sent by mid-May to Grafenwoehr, Germany, where roughly 250 Ukrainians will undergo a 10-week training course with US troops, a US official told reporters traveling with Defense Secretary Lloyd Austin. The tanks are a long-awaited capability for Ukraine, which has been battling Russia for more than a year. In total, the US is providing 31 tanks, the size of one Ukrainian tank battalion. 

On the ground: A dancer with Odesa Opera has been killed while fighting on the front line, the ballet company has said. International Atomic Energy Agency experts at Ukraine’s Zaporizhzhia nuclear power plant have heard shelling nearly every day over the past week, the agency said in an update on Friday. At one point, they were told to shelter at the site because of the potential dangers, according to an update from IAEA Director General Rafael Grossi.