By Guy Faulconbridge and Max Hunder MOSCOW/KYIV (Reuters) -On the eve of peace talks, Ukraine and Russia sharply ramped up the war with one of the biggest drone battles of their conflict, a Russian highway bridge blown up over a passenger train and an ambitious attack on nuclear-capable bombers deep in Siberia.

The Federal Government has denied knowledge of a controversial Russian work-study programme linked to the production of military drones used in the war

In an undisclosed location near the front line, Vanya, a Ukrainian soldier, traverses through a field covered in the traces of a deadly Russian weapon.

Russia Ukraine war has escalated further as Ukrainian President Volodymyr Zelenskyy-headed country carried out a surprising attacks deep in Russian territory.

Ukraine has carried out large-scale drone strikes against four airbases deep inside Russia, destroying multiple combat planes, according to a source in the Ukrainian Security Service (SBU).

Two bridges have collapsed, causing trains to derail, in separate incidents within Russia, which Vladimir Putin's officials have blamed on "interference", a likely reference to Ukrainian saboteurs.At least seven people were killed and 30 suffered injuries after a bridge collapsed and a train derailed in Russia's Bryansk region that borders Ukraine,

The rapidly evolving drone technology on display in Ukraine shows the Western way of slow procurement isn't enough, the UK armed forces minister said.