Can a member country exit the OECD?
Convention on the Organisation for Economic Co-operation and Development
Any Contracting Party may terminate the application of this Convention to itself by giving twelve months' notice to that effect to the depositary Government.
The "depositary Government" is "the Government ...
The Model Tax Convention
The Model Tax Convention is the basis for agreements among OECD members regarding international tax agreements. It basically helps them coordinate taxation policy.
One of the core purposes of the Convention is to keep a person from being taxed twice for the same thing:
International juridicial double taxation can be generally ...
Yes, it seems that intervention in Ukraine is one of the major reasons that is a road-block to Russia's OECD membership (OECD statement, 2014):
13/03/2014 - Further to a meeting of its governing Council on 12 March
2014, the OECD has postponed activities related to the accession
process of the Russian Federation to the OECD for the time being.
Both OECD and Eurostat follow the International Labour Office's definitions of "employed". ILO's definitions can be found in 1982's Resolution concerning statistics of the economically active population, employment, unemployment and underemployment:
(1) The "employed" comprise all persons above a specified age who during a ...
OECD takes all its data for EU countries, Iceland, Norway, Switzerland and Turkey from Eurostat. The data are collected by national agencies in Labour Force Surveys and are processed centrally by Eurostat. The European Union Labour Force Survey is the final product.
Although Eurostat generally follows ILO's definitions, and records the same set of ...
Your rough understanding is exactly the definition OECD provides in their Glossary of Statistical Terms:
Employment rate represent persons in employment as a percentage of the population of working age (15- 64 years).
For OECD's definition of "persons in employment", see: How is an employed person defined for OECD countries?