Ukraine's bid to join the European Union (EU) has received a boost this week. Accession negotiations have finally kicked off. Ukraine is hoping that will provide it with some security guarantees, as the war with Russia drags on. Moscow has long objected to Kyiv strengthening its ties with the West. And now, Ukraine will have to fulfil the EU's requirements before it can be accepted as a member. That will include reforms on a host of issues, including tackling corruption. But what are the risks of integrating a country at war into the bloc? And how will Russia respond?