Global talent with foreign income tax

I moved to the UK on a global talent visa 2 month ago. I'm jobseeker in UK now, but I'm working from home for a foreign company. I have foreign income now. I pay tax 13% with my foreign income in Russia. 1. Must I pay tax from this foreign income in UK? 2. If so, can I do self assessment next year before 05 October 2025? 3. Must I pay only difference between 20% and 13%, which I have already paid? Best regards, Alexandra!

Hi,
You can see guidance here:
Tax on foreign income
Thnk you.