The US encouraged its people to leave Ukraine on Tuesday, warning Russia was poised to attack civilian and government facilities in the coming days as the crisis entered its sixth month.

The warning came after the Ukrainian authorities prohibited festivities in the capital Kyiv on Wednesday’s anniversary of freedom from Soviet control owing to security concerns.

According to the Ukrainian military, Russian forces carried out artillery and air attacks in the Zaporizhzhia area of southeastern Ukraine, where combat has taken place near Europe’s largest nuclear power facility.

However, six months after Russia’s Feb. 24 invasion of Ukraine, with thousands of dead and vast destruction of cities, the battle has reached a standstill.

Russian soldiers hold a considerable portion of the south, including the Black Sea coast, as well as portions of the eastern Donbas area. Peace appears to be nearly non-existent.

Although it was not the first time the US issued such a warning, this one came as Ukraine was about to celebrate 31 years of freedom from Soviet control on Wednesday.

Darya Dugina, the daughter of a renowned Russian ultra-nationalist, was also killed in a vehicle bomb assault in Moscow on Saturday. Moscow has blamed the murder on Ukrainian spies, which Kyiv rejects.

Kyiv is far from the frontlines and has only rarely been hit by Russian missiles since Ukraine repelled a ground offensive to seize the capital in March.