Answer:
It has been irregular since the transition to democracy.
Explanation:
Russia transitioned to democracy in 1993, two years after the fall of the Soviet Union in 1991.
We can see from the information in the graph, that while in 1992, military spending was very high, at 70 billion dollars, it dropped to just 20 billion in 1998, and 14 years later became even higher than in 1992, sitting at 90 billion dollars.
This information tells us that the graph has a V shape, and that Russia, as democratic republic, has had periods of lower military spending, and periods of higher military spending. In other words, Russian military spending has been irregular since the transition to democracy.