I suppose that you can say that Ronald Reagan's more aggressive approach to defense during his two terms in office helped to cause the Soviet Union to collapse.
When Reagan came into office, he increased defense spending and started in on things like the Strategic Defense Initiative (aka Star Wars). You can argue that doing this undermined the Soviet Union.
What happened is that the Soviet Union had to increase its spending to keep up with the US. But the Soviets weren't as rich as the US and so this added spending ruined them and that led to the downfall of the Soviet Union and the end of the Cold War.