Russian forces on Thursday launched a missile attack on the Kyiv area for the first time in weeks and pounded the northern Chernihiv region as well, in what Ukraine said was revenge for standing up to the Kremlin.

Meanwhile, Ukrainian officials announced a counteroffensive to take back the occupied Kherson region in the country’s south, territory seized by Russian President Vladimir Putin’s forces early in the war.

Also read: Weddings in the time of war: Ukrainians refuse to let conflict get in the way of love

Russia attacked the Kyiv region with six missiles launched from the Black Sea, hitting a military unit in the village of Liutizh on the outskirts of the capital, according to Oleksii Hromov, a senior official with Ukraine’s General Staff.

He said that the attack ruined one building and damaged two others, and that Ukrainian forces also shot down one of the missiles in the town of Bucha.

Also read: How Olena Zelenska became central to Ukraine’s diplomacy

Fifteen people were wounded in the Russian strikes, five of them civilians, Kyiv regional Gov. Oleksiy Kuleba said.

Kuleba linked the assaults to the Day of Statehood, a commemoration that President Volodymyr Zelensky instituted last year and Ukraine marked for the time on Thursday.

“Russia, with the help of missiles, is mounting revenge for the widespread popular resistance, which the Ukrainians were able to organise precisely because of their statehood,” Kuleba told Ukrainian television. “Ukraine has already broken Russia’s plans and will continue to defend itself.”

Also read: Ukraine’s Volodymyr Zelensky, Olena Zelenska pose for Vogue, see pics

Chernihiv regional Gov. Vyacheslav Chaus reported that the Russians also fired missiles from the territory of Belarus at the village of Honcharivska. The Chernihiv region had not been targeted in weeks.

Russian troops withdrew from the Kyiv and Chernihiv regions months ago after failing to capture either. The renewed strikes come a day after the leader of pro-Kremlin separatists in the east, Denis Pushilin, urged Russian forces to “liberate Russian cities founded by the Russian people — Kyiv, Chernihiv, Poltava, Odesa, Dnipropetrovsk, Kharkiv, Zaporizhzhia, Lutsk.”

Also read: Why US inflation is going up and when will it come down

Kharkiv, Ukraine’s second-largest city, also came under a barrage of shelling overnight, according to the mayor. Authorities said a police officer was killed in the Russian shelling of a power plant in the Kharkiv region.

The southern city of Mykolaiv was fired on as well, with one person reported injured.

Also read: Inflation hits NYC’s bodega favourite: Bacon, egg and cheese

Meanwhile, the Ukrainian military kept up a counterattack in the Kherson region, knocking out of commission a key bridge over the Dnieper River on Wednesday.

Ukrainian media quoted Ukrainian presidential adviser Oleksiy Arestovich as saying the operation to liberate Kherson is underway, with Kyiv’s forces planning to isolate Russian troops and leave them with three options — “retreat, if possible, surrender or be destroyed.”