Ukrainian intelligence was behind the explosion of a freight train in Russia’s Far East, according to an official familiar with the operation, an attack that would extend the agency’s reach deep into Siberia.

Storms have battered southern and eastern Ukraine, as well as parts of Russia, reportedly hampering Moscow’s campaign around Avdiivka.

A Russian general has reportedly been blown up by a landmine along the front line in Ukraine. Major General Vladimir Zavadsky, deputy commander of the 14th Army Corps, was said to have stepped on the explosive on Tuesday.

Major-General Vladimir Zavadsky, 45, was deputy commander of Russia's 14th Army Corps and perished 'as a result of a mine explosion in the rear area.

Russian forces were ramping up attacks in eastern Ukraine on Wednesday, Moscow and Kyiv said, as they vie to secure elusive territorial gains before the end of the year.Poland also reiterated support for Kyiv by announcing it was boycotting an international security meeting due Thursday over the invitation of Russian Foreign Minister Sergei Lavrov.