Saudi Arabia, the United Arab Emirates, Egypt and Bahrain cut diplomatic and trade links with Qatar on June 5, accusing the world's biggest exporter of liquefied natural gas of financing terrorism and cozying up to their arch-rival Iran. Doha denies the charges.
Saudi Arabia's Crown Prince Mohammed bin Salman spoke by phone with Sheikh Tamim a week ago in what looked like a breakthrough. But Riyadh promptly suspended any dialogue with Doha, accusing it of "distorting facts" in its news agency's report of the interaction.
"As you know we have had a siege of more than 100 days against Qatar," Sheikh Tamim told a joint news conference with German Chancellor Angela Merkel in Berlin. "We spoke about Qatar's readiness to sit at the table to solve this issue."
For her part, Merkel said she was concerned that there was still no solution to the crisis, adding she supported efforts by Kuwait and the United States to mediate an end to the dispute.
Sheikh Tamim also said he retained confidence in German firms and will hold on to stakes in Deutsche Bank and Volkswagen.
Separately, Qatar's foreign ministry warned its citizens against travelling to Egypt, because it said the authorities there had imposed "security measures" on Qataris entering the country. It did not provide details in a statement.