Estonian Prime Minister Kaja Kallas submitted her resignation on Monday in order to take up a new job as the European Union’s foreign policy chief, the president’s office said, writes Reuters.

Kallas will remain as Estonia’s caretaker prime minister until the next government is confirmed by early August, Estonia’s public broadcaster ERR said.

Her party will elect its new leader on September 8.

Kallas, 47, has emerged as a strong critic of neighbouring Russia and what she says are its expansionist aims since she became prime minister in early 2021. She has pressed Estonia’s allies in NATO and the EU to provide unconditional support for Ukraine in its struggle to push back Moscow’s invading forces.