Germany is to provide an additional €100m (£84m) in aid to Ukraine this winter.
Annalena Baerbock, Germany's foreign minister, announced the extra help during a visit to Moldova.
Russia is planning a "winter war with the aim of making the lives of people in Ukraine as terrible as possible", Ms Baerbock said.
Extra air defences are needed to allow repairs to infrastructure, Kyiv has said.
That, in turn, will help to secure demand for power during the winter, when temperatures can drop far below zero.
In July, meanwhile, it was reported that Germany plans to halve its military aid to Ukraine next year.
According to a draft of the 2025 budget seen by Reuters, German assistance will be cut to €4bn (£3.4bn).
