The United States and its allies have imposed broad economic penalties on Russia over its war in Ukraine. As the conflict continues, experts debate whether the sanctions are working.

Diplomatic efforts have seen little progress in halting the fighting, including Monday's phone call between President Trump and Russian leader Vladimir Putin.

EU urges Trump to hit Moscow with sanctions after threats to drop Putin peace talks - US president claims progress made in his two-hour call with Putin, but repeats his threats to abandon efforts at b