The struggle for control of Venezuela intensified on Wednesday, as the government prepared an investigation that could lead to the arrest of opposition leader and self-declared interim president Juan Guaido, who has called for new street protests.

Venezuelan President Nicolas Maduro said on Wednesday he was ready to sit down for talks with the country’s opposition and open to the possibility of third countries mediating, Russia’s RIA news agency reported.

The collapse of a Brazilian tailings dam owned by Vale last week ranks among the worst mining disasters in decades. More than 300 people are feared dead after the dam failure near the town of Brumadinho released a torrent of mining waste into Vale’s facilities and a nearby community in Minas Gerais state.

Vale SA, the world’s largest iron ore miner, on Tuesday vowed to take as much as 10 percent of its ore output offline in order to decommission 10 more dams like the one that burst last week, killing scores of workers and nearby residents.

President Nicolas Maduro said on Wednesday his Russian counterpart Vladimir Putin had given Venezuela support on all fronts and that Caracas was grateful, Russia’s Sputnik news agency reported.

Philippine authorities called for calm on Wednesday after a grenade attack on a mosque in a mainly Christian southern province killed two people, just three days after a devastating church bombing shook the restive Mindanao region.

Tanzania’s parliament passed amendments to legislation late on Tuesday that give sweeping powers to a government-appointed registrar over political parties, a move that opposition legislators say will cement “one-party rule”.

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A South Korean appeals court on Wednesday nearly doubled jail time for a former speed skating coach convicted of hitting a two-time Olympic champion, citing a need to warn sports officials against the use of violence as a training tool.