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.

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.

Since last sitting down with Ukraine to talk peace, Russia has launched four of its five largest drone attacks against the country, killed more than 340 of its civilians and continued to peddle its false narrative about the unprovoked war it has been waging for more than a decade.

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.

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).

Hundreds of towns are under evacuation orders in Ukraine’s northeastern Sumy region where Russian forces are focusing their attacks, as Kyiv officials warn it could be preparing a new offensive.Mandatory evacuation orders were issued for 11 settlements on Saturday,

Drone warfare is evolving at a rapid speed, with Ukraine a testing ground for companies to refine their products. Those not there are missing out.