The contract of assignment dated 21 May 2014, whereby Energoproekt assigned its rights against Enka to the ultimate employer (PJSC Unipro ("Unipro")), reiterated the arbitration agreement in the Contract. A fire broke out in February 2016 at the plant, causing substantial damage. Between November 2016 and May 2017, Unipro's insurer (Chubb Russia) paid out c. US$400 million under an insurance policy, thereby becoming subrogated to Unipro's rights as against Enka. On 25 May 2019, Chubb Russia (a defendant / the respondent in the English proceedings) commenced legal action against Enka before the Moscow Arbitrazh Court ("Moscow Claim"), blaming Enka to have caused the fire due to its defective fuel oil pipelines. Enka denied any liability, on the basis that the works alleged to have caused the fire were excluded from scope and performed by another subcontractor. This was seemingly conceded by Unipro in its correspondence with Enka during the aftermath of the fire.