On the basis of the information you have provided, you were tax resident in the UK in 2022/23, and you should therefore declare your foreign income, that is your Ukrainian employment income and claim credit for the Ukranian tax deducted, through Foreign Tax Credit Relief by completing a 2023 Self Assessment tax return. Youi can see guidance here:
Tax on foreign income
You are potentially eligible to claim the remittance basis, but you may wish to consider whether it suits your particular circumstances by looking at the guidance here:
Remittance basis 2021 (HS264)
As regards your NIC query, please contact our National Insurance team:
National Insurance: general enquiries
HMRC is unable to comment on the prohibition of payments abroad from your Ukrainian account, as that is a matter for the Ukrainian authorities.