In a nationwide address that was delayed from its prime-time Tuesday delivery and ahead of votes in four Ukraine regions to join Russia, on Wednesday morning Russian President Vladimir Putin announced a partial military mobilization, while vowing to use all means necessary to defend Russia and pledged to annex the territories already occupied by Russia, raising the stakes in the seven-month-old conflict.

Calling the moves "urgent, necessary steps to defend the sovereignty, security and territorial integrity of Russia," Putin said that Russia is fighting the full might of NATO. The US and its allies, he said, are seeking to "destroy" Russia.

The partial mobilization means that reservists will be drafted into military service, Putin said, starting immediately. The Armed Forces will draw on military reservists only, and those who have completed national service, the president said promising that they will be provided with additional training along with all the benefits due to people involved in active duty.