E-commerce giant Amazon has asked Crimean users to shut down their accounts within a week due to U.S. sanctions imposed against the peninsula over its unification with Russia in March 2014.

"Due to economic sanctions recently announced by the United States Government … you must remove all resources from AWS [Amazon Web Services] and close your AWS account by 12 a.m. PST, Friday, February 13, 2015," a copy of the letter posted on the outlet's website said.

This comes as the majority of U.S. companies have been leaving the region one by one since U.S. President Barack Obama in December followed the European Union banning the export of goods, technology and services to Crimea.

"[The order] is intended to provide clarity to U.S. corporations doing business in the region and reaffirm that the United States will not accept Russia's occupation and attempted annexation of Crimea," Obama said in a statement.

Visa and MasterCard, the world's two largest payment card companies, as well as online payment service PayPal and the U.S. tech giant Apple had quitted Crimea following the sanctions.