MOSCOW, April 26 -- Iran's foreign minister arrived in Russia on Monday as peace efforts between Tehran and Washington hung in the balance, following a flurry of regional diplomacy and the collapse of planned talks in Pakistan.

Abbas Araghchi arrived in Saint Petersburg, the Iranian Foreign Ministry said on Telegram, where he is expected to meet with Russian President Vladimir Putin.

It comes after Araghchi visited Oman between trips to Pakistani capital Islamabad, as mediators push to keep peace talks between Tehran and Washington alive.

On Saturday, US President Donald Trump scrapped a planned trip to Islamabad by his envoys Steve Witkoff and Jared Kushner.

In a sign that efforts were ongoing, the Fars news agency said Iran had sent...