Originally, this was a Newsday article, and the link is now dead. Here's what I have:
By Associated Press
November 23, 2002, 9:03 PM EST
BEIJING -- North Korea plans to ban the use of U.S. dollars inside its country starting next month, China's official Xinhua News Agency reported.
American dollars will not be accepted in foreign exchange shops and foreign residents must convert the U.S. currency in their bank accounts to euros or other currencies, Xinhua said in a dispatch from Pyongyang, the capital of North Korea.
The announcement came amid growing tension over North Korea's atomic weapons program...
-------
Here is a small reference to the use of euros having a negative effect on the value of the dollar:
On the financial front the Saudi's have threatened to sell their US securities and withdraw their funds and convert to Euros (and some say gold) if war broke out. The Muslim countries are also getting closer to the creation of a Gold Dinar www.bankindex.com (now a dead link) Gold Dinar: An Economic and Strategic Response to Chaos by Michael Billington from the November 15, 2002 Executive Intelligence Review), which would be intended for use as currency amongst Islamic countries. Even one of these acts would be extremely negative for the US Dollar (and by extension be very positive for gold). Both together could cause a collapse in the world's reserve currency and begin to bankrupt the US.
http://www.gold-eagle.com/editorials_02/chapmand111902.html---
This link is still good:
North Korea Embraces the Euro. BBC
http://news.bbc.co.uk/2/hi/asia-pacific/2531833.stmCommunist North Korea has said it will stop using American dollars from Sunday and start using euros instead...
No official reason was given for the move but many analysts believe the dollar ban is a direct political response to Washington's decision last month to halt fuel aid to the North because of its nuclear programme.
Others believe the move could also be an attempt by the regime to exercise state control over money held by private individuals.
-----
Here's a Monbiot link, but you'll have to hunt around because the Guardian article is old.
The Bottom Dollar
The way to check American power is to support the euro
By George Monbiot. Published in the Guardian 22nd April 2003
...Only one means of containing the US remains. It is deadly and, if correctly deployed, insuperable. It rests within the hands of the people of the United Kingdom.
Were it not for a monumental economic distortion, the US economy would, by now, have all but collapsed. It is not quite a West African basket case, but the size of the deficits and debts incurred by its profligacy would, by any conventional measure, suggest that it was in serious trouble. It survives only because conventional measures do not apply: the rest of the world has granted it an unnatural lease of life.
Almost 70% of the world's currency reserves - the money which nations use to finance international trade and protect themselves against financial speculators - takes the form of US dollars. The dollar is used for this purpose because it is relatively stable, it is produced by a nation with a major share of world trade, and certain commodities, in particular oil, are denominated in it, which means that dollars are required to buy them.
The United States does very well from this arrangement. In order to earn dollars, other nations must provide goods and services to the US. When commodities are valued in dollars, the US needs do no more than print pieces of green paper to obtain them: it acquires them, in effect, for free. Once earned, other nations' dollar reserves must be invested back into the American economy. This inflow of money helps the US to finance its massive deficit...
I have a lot more of the Monbiot article if you want it.
So, yes, all three members of the axis of evil all threatened euro usage.