Russian police detained around 150 people at a meeting of independent and opposition politicians in Moscow on Saturday, accusing them of links to an "undesirable organisation", a monitoring group and a TV station said.

The detentions come amid a crackdown on anti-Kremlin sentiment, following the arrest and imprisonment of opposition politician Alexei Navalny (above) who returned to Russia in January after recovering from a nerve agent poisoning in Siberia.