My hon. Friend makes a good point. Many reasons have been given as to why Russia annexed Crimea, one of which is that keeping Ukraine at war prevents it from joining NATO. That goes beyond being a conspiracy theory; it is something we ought to recognise.
The UN General Assembly produced two resolutions; I understand that we co-sponsored one. Those resolutions called on states and international organisations not to recognise any change in Crimea’s status, and affirmed the commitment of the United Nations to recognise Crimea as part of Ukraine. The referendum also violated, among other agreements, the 1994 Budapest memorandum on security assurances for Ukraine. Under that agreement, Ukraine gave up the nuclear weapons that were on its territory in exchange for independence and undertakings given by Russia.
There is no precise data on what effect the illegal annexation of Crimea by Russia has had, but a quick calculation shows that Ukraine has been robbed of the following assets: 3.6% of GDP; 4,000 enterprises; 10% of port infrastructure; 80% of oil and gas deposits; and 70% of potential natural gas deposits in the Black sea.