Russia fired more than 100 drones and two ballistic missiles at Ukraine overnight, the Ukrainian air force said Tuesday, as the country's foreign ministry noted that Moscow's recent threat to hit Kyiv especially hard from the air brought nothing new.

Russia on Monday urged foreign citizens, including members of diplomatic missions, to leave the Ukrainian capital as quickly as possible and told residents to steer clear of military and government facilities. It said that "systemic strikes" on Kyiv were being prepared.

Foreign ministers from Australia, India, Japan and the United States announced new initiatives on Tuesday on maritime security, port infrastructure and energy to boost cooperation in the Indo-Pacific to counter concerns about China's growing influence.

The announcements by the group of nations known as the Quad came after talks in New Delhi between India's Foreign Minister Subrahmanyam Jaishankar, U.S. Secretary of State Marco Rubio, Japanese Foreign Minister Toshimitsu Motegi and Australian Foreign Minister Penny Wong.

Iran warned Monday that, while some progress had been made, it was not yet close to striking a deal with the United States to end the Middle East war, after a weekend of mixed messages from Washington and Tehran.

World oil prices tumbled on renewed optimism about an agreement, after top U.S. diplomat Marco Rubio suggested a deal could be reached within the day -- but Iran's foreign ministry spokesman responded: "No one can make such a claim."

U.S. President Donald Trump has assured Israeli Prime Minister Benjamin Netanyahu he will hold firm on his demand for the dismantling of Iran's nuclear program as a condition in any final agreement with Tehran, a senior Israeli official told AFP on Sunday.

U.S. President Donald Trump said Sunday that he had told U.S. negotiators "not to rush into a deal" with Iran, amid anticipation that an agreement to end the war in the Middle East was close.

"The negotiations are proceeding in an orderly and constructive manner, and I have informed my representatives not to rush into a deal in that time is on our side," Trump wrote on his Truth Social account.

Pakistan's Prime Minister Shehbaz Sharif said on Sunday he hoped his country could soon host the next round of peace talks between Iran and the United States.

U.S. Secretary of State Marco Rubio said an announcement was possible later Sunday on a deal with Iran that could formally end the Middle East war, insisting goals had been met.

The United States and Iran could strike a deal to end the Middle East war as early as Sunday, Washington's top diplomat said, while Tehran insisted the agreement would do nothing to limit its nuclear program.

A gunman opened fire near the White House on Saturday evening, with U.S. Secret Service agents killing the assailant in a shoot-out during which a bystander was also struck, authorities said.

U.S. President Donald Trump said Saturday a deal with Iran had been "largely negotiated," with the proposal including opening the crucial Strait of Hormuz, though the agreement was "subject to finalization."