A pregnant woman and her husband killed in Kyiv by what Ukrainian officials said was a Russian “kamikaze” drone strike were inseparable, like “yin and yang,” their close friend has told CNN.

“These people loved life,” Anna Petrukova said of Victoria Zamchenko and her husband Bohdan, both 34, who she described as a “wonderful couple.”

“They had a lot of plans – they dreamed of their own home, children, a full-fledged family, travel. They had very big plans for this life,” Petrukova said.

The Zamchenkos died at home in their apartment in Kyiv on Monday, following a barrage of strikes by Russian-launched, Iranian-made “kamikaze” drones, according to Ukrainian officials.

Victoria Zamchenko was six months pregnant with the couple’s first child.

Drones have played a significant role in the conflict since Russia launched its full-scale invasion of Ukraine in late February, but their use has increased since Moscow acquired new drones from Iran over the summer.

Unlike more traditional, larger and faster military drones that return to base after dropping missiles, “kamikaze” drones are designed to crash into a target and explode, detonating their warhead and destroying the drones in the process.

The Ukrainian military and US intelligence say Russia is using Iranian-made attack drones. US officials told CNN in July that Iran had begun showcasing Shahed series drones to Russia at Kashan Airfield south of Tehran the previous month.

In August, US officials said Russia had bought these drones and was training its forces how to use them. According to Ukraine’s President Volodymyr Zelensky, Russia has ordered 2,400 Shahed-136 drones from Iran.