In this week's roundtable discussion, we focus on Europe's economic challenges, including the debt crisis in Greece that has many Europeans worried about their common currency. We also focus on Iran and what the regime is trying to achieve by moving to a higher level of uranium enrichment. Carla Robbins and Garrick Utley join Daljit Dhaliwal.

Today's New York Times reports that the Iranian government has engaged in "an epidemic" of arrests in advance of the 31st anniversary of the Iranian Revolution tomorrow. The crackdown is designed to head off opposition street protests. For more on the situation inside Iran, Daljit Dhaliwal interviews Ervand Abrahamian.

After months of conflicting signals on its nuclear intentions, Iran formally moved forward today on a significant change in its uranium enrichment program. Patrick Clawson, deputy director for research at the Washington Institute for Near East Policy, joins Daljit Dhaliwal to discuss the issue. Worldfocus partner Deutsche Welle reports on the controversy.

Iran's nuclear ambitions are again taking center stage. In a TV interview, Mahmoud Ahmadinejad said his country is ready to honor a deal to curb its nuclear program. The agreement would require Iran to send uranium abroad to be processed for civilian use. But several countries involved in negotiations are skeptical. Nazanine Moshiri of Al Jazeera English has more.

Iran is trying to tackle a rising drug problem, as opium continues to pour into the country from neighboring Afghanistan. Al Jazeera English's Alireza Ronaghi reports that Iranian police have seized over 400 tons of drugs and have lost dozens of police officers in the battle to eliminate drug abuse in Tehran. But some Iranian officials say their efforts are pointless.