Dmitry Medvedev promises economic and military development of territory disputed since the end of World War Two.
Impressive official events but also emotional marches by people carrying portraits of loved ones who served in WW2.
But seals prove more adept at undertaking polar missions, including potentially killing intruders, say experts.
'Spy plane' was monitoring Siberia under Open Skies treaty aimed at reducing tension after Cold War.
Up to 38 people trapped in building as rescue underway.
Emergency services refuse to comment cause of extraordinary blast in the dark sky.
Russia's Pacific Fleet divisions take position in Kamchatka.