What is Ukraine’s 40-day campaign against Russia and has it worked?

On 26 June, the Ukrainian president, Volodymyr Zelenskyy, announced that he was ordering Ukraine’s state security service to launch a 40-day campaign against Russian targets aimed at “influencing the aggressor state in order to compel it to end to the war”.

Since then, Kyiv has sharply escalated attacks on Russia under the aegis of a series of overlapping operations striking key supply lines in Ukraine’s Russian-occupied territories, including Crimea, and striking Moscow and St Petersburg in a series of high-profile long-range missile attacks, triggering a fuel crisis.

Three weeks in to the 40-day campaign, as it becomes clearer what it involves, how successful has it been and what does the operation say about the future course of the war?