Iran live updates: Trump to hold national security meeting Monday, officials say

In an address to students on Monday, German Chancellor Friedrich Merz said the U.S. has "no strategy" with Iran.

"I cannot see what strategic exit the Americans are now opting for, especially as the Iranians are obviously negotiating very skillfully -- or, rather, very skillfully not negotiating and letting the Americans travel to Islamabad (in Pakistan) only to leave again without any results," Merz said. "An entire nation is being humiliated by the Iranian state leadership, particularly through these so-called Revolutionary Guards."

"We offered, as Europeans -- and said that we were willing -- after the end of negotiations to help getting the Strait of Hormuz open again," he continued. "... We can help there but first the fighting needs to end. And at the moment I do not see how this can be realized in the near future because the Iranians are clearly stronger than one thought and the Americans clearly don't seem to have a convincing negotiating strategy."

Kremlin spokesperson Dmitry Peskov told reporters that Iranian Foreign Minister Abbas Araghchi is due to meet with Russian President Vladimir Putin on Monday, as part of the Iranian diplomat's visit to St. Petersburg.

"The significance of this conversation is hard to overestimate in terms of how the situation around Iran and in the Middle East is developing," Peskov said.

Putin will meet with Araghchi at St. Petersburg's Presidential Library, Peskov said.

President Donald Trump is expected to hold a meeting with key members of his national security team concerning the situation in Iran on Monday, according to two U.S. officials familiar with the plans.

The anticipated meeting comes as the Trump administration has grown increasingly bullish on the impact of its ongoing naval blockade of Iran's ports and increasingly skeptical that talks with Iran's current negotiators can yield the desired results, one of the officials said.

The official added that while Iran has proposed new terms for a deal to more permanently resolve the conflict between the countries over the weekend, those terms still appear to fall well short of the administration's red lines.

Iranian Foreign Minister Abbas Araghchi will meet with Russian President Vladimir Putin in St. Petersburg during his scheduled trip to Russia Monday, according to Iran's ambassador to Russia, Kazem Jalali.

"In continuation of the diplomatic jihad to advance the country's interests and amid external threats, the Foreign Minister of the Islamic Republic of Iran will meet with the President of Russia during his trip to St. Petersburg," Jalali said in a post on X Sunday afternoon.

It was a busy weekend for Araghchi, who traveled to Oman once and Pakistan twice before heading to Russia Sunday evening.

Iran's semi-official news agencies Fars and ISNA reported that Tehran conveyed written messages to the U.S. via Pakistani mediators, letters that addressed some of Iran's "red lines," including issues related to its nuclear program and the blockade of the Strait of Hormuz.

-ABC News' Claire Bower