United Kingdom is approximately 243,610 sq km, while Ukraine is approximately 603,550 sq km, making Ukraine 148% larger than United Kingdom. Meanwhile, the population of United Kingdom is ~65.8 million people (21.8 million fewer people live in Ukraine).
This to-scale map shows a size comparison of United Kingdom compared to Ukraine. For more details, see an in-depth quality of life comparison of Ukraine vs. United Kingdom using our country comparison tool.