LONDON -- Russia overnight launched a heavy air attack on Ukraine -- including striking Kyiv with drones and ballistic missiles -- that killed at least six people, including two children.

Russia launched a large-scale air attack on Ukraine early Wednesday, causing power outages across most of the country, setting homes ablaze and killing at least six people, including a six-month-old baby,

The attack on the Bryansk facility came hours before Russian attacks left six people dead in Ukraine, officials said.

By Dmitry Antonov, Pavel Polityuk and Simon Johnson MOSCOW/KYIV/LINKOPING, Sweden (Reuters) -Russia said on Wednesday it had carried out a major training exercise involving nuclear weapons, a day after the United States announced a delay in plans for a second summit between presidents Vladimir Putin and Donald Trump on the war in Ukraine.

The Swedish-made JAS 39 Gripen would dramatically help modernize Ukraine's air force.

Russian jets violated NATO airspace over Lithuania for 18 seconds during suspected refueling exercise. Nation's president calls it a breach of international law amid tensions.

After plans for a summit between Russian President Vladimir Putin and U.S. President Donald Trump were shelved, Ukraine is appealing to allies for more support in an effort to dial up the pressure on Russia.

Nato has once again been forced to scramble fighter jets after the "cruel" Vladimir Putin breached Lithuania's airspace. Lithuanian President Gitana Nauseda confirmed on Thursday night that his nation's airspace was violated by Russian warplanes.