Could it happen again?

During the past days, the Russian military have been gowing threw out many differant military exercises , wich includes the missile tests.
Before the collapse of the Soviet Union, Russia had been considered as a threat to the world, because of the mass weaponry and capabilities they have. During the cold war the Soviet Union showed off there mass weaponry and threatended the US if they attack, wich many people say that that could have been the start of a new war, world war 3. Threw out the years the Russian military have been executing military exercises, and in the past years a TU-95 bear bomber flew into canadian airspace wich panicked many people who thought they where going to attack but the RCAF sent F-18 fighter jets who intercepted the bomber and told them to leave canadian airspace, but the russians have bean saying that it was only an exercise.
No one ones the truth, and with the various missile tests that the russian military had been doing, could this mean that they are re-arming for a new war ? .
In my opinion i think that every military force in the world, has the right to do anything they want because next thing you know theres a spy that is creating lies.
I think that if they train, they could have atleast told the public about it , so that no problems could happen.