MOSCOW, May 22 (RAPSI, Maria Petrova) - Moscow's Lefortovsky District Court on Wednesday again extended the arrest of Kazakh-born Ilya Pyanzin, who is suspected of planning to assassinate Vladimir Putin, court secretary Yulia Skotnikova told RAPSI.

In February 2012, the Russian and Ukrainian security services reported that the suspects in the case, who were earlier placed on the international wanted list, had been arrested in Odessa. According to the investigators, Chechen-born Adam Osmayev and Ruslan Madayev, as well as Kazakh-born Ilya Pyanzin, organized a safe house in an apartment in Odessa.

The extremist group was exposed and neutralized in January and February 2012 after a bomb made from saltpeter, aluminum powder and other substances accidentally detonated in the apartment, killing Madayev.

Pyanzin, who was detained first, told Ukrainian security officers that his accomplices were preparing a bomb to assassinate then Prime Minister Vladimir Putin and Chechen leader Ramzan Kadyrov. They planned to detonate it close to Putin's motorcade as he drove through Moscow.

In April 2012 the Lefortovsky court issued arrest warrants in absentia for Pyanzin and Osmayev. They were charged with being members of an illegal armed group, with planning an assassination attempt against a state leader and with unauthorized weapons manufacturing, storage and possession. If sentenced, they may face up to 20 years in prison.

The Primorsk Court of Odessa began the hearings over Osmayev's case in December 2012.

Last year Kiev approved Russia's request for Osmayev's extradition, but his attorneys, who said their client feared for his life in Russia, appealed to the European Court of Human Rights and the decision was suspended.

Pyanzin was extradited to Moscow in 2012.