Which of the following resources have been the main contributors to Russia’s wealth in recent years?

The main contributors to Russia's wealth in recent years are:

1. Oil and Gas: Russia is one of the world's largest producers and exporters of oil and natural gas. Revenue from the extraction, production, and export of these resources has been a major contributor to the country's wealth.

2. Metals and Minerals: Russia possesses significant reserves of minerals such as coal, iron ore, nickel, copper, and gold. Mining and export of these resources have also been important contributors to the country's wealth.

3. Arms Sales: Russia is one of the world's leading arms exporters. The sale of military equipment and weapons to other countries has been a lucrative business for Russia, contributing to its wealth.

4. Agriculture: Russia has vast agricultural land, and its agricultural sector has seen significant growth in recent years. The production and export of grains, such as wheat, have contributed to the country's wealth.

5. Technology and Innovation: Russia has a strong technology sector, particularly in software development and engineering. Companies like Yandex, Kaspersky Lab, and Mail.ru have contributed to Russia's wealth through technological advancements and exports.

However, it is important to note that Russia's wealth has been largely dependent on the fluctuating global prices of commodities, such as oil and gas.