KYIV, Ukraine (AP) — Ukraine imposed emergency power shutdowns in most of the country on Sunday, a day after Russia unleashed large-scale attacks on energy infrastructure and claimed it made gains in the eastern Donetsk province.

The shutdowns were in place in all but three regions of Ukraine following Saturday’s drone and missile attack on energy targets that injured at least 19 people.

Ukraine’s state-owned power grid operator Ukrenergo said the shutdowns affected both industrial and household consumers.

Sustained Russian attacks on Ukraine’s power grid in recent weeks have forced the government to institute nationwide rolling blackouts. Without adequate air defenses to counter assaults and allow for repairs, though, the shortages could still worsen as need spikes in late summer and the bitter-cold winter.

Among the most significant recent strikes were an April barrage that damaged Kyiv’s largest thermal power plant and a massive attack on May 8 that targeted power generation and transmission facilities in several regions.