UN Secretary-General Antonio Guterres on Monday met Russian Foreign Minister Sergei Lavrov, and discussed the Ukraine crisis, as well as the situation in Afghanistan and Syria.

With regard to the Black Sea Grain Initiative, which allows the export of Ukrainian grain and other agricultural products from Black Sea ports, Guterres expressed concerns about the recent obstacles encountered by the Joint Coordination Center in its daily operations, according to a readout of the meeting issued by the UN chief's press office.

Guterres presented Lavrov with a letter to Russian President Vladimir Putin, outlining a proposed way forward aimed at the improvement, extension and expansion of the Black Sea Grain Initiative, taking into account positions recently expressed by the parties and the risks posed by global food insecurity, said the readout.

The UN chief took note of the concerns expressed by Russia on the implementation of the memorandum of understanding between Russia and the UN Secretariat on promoting Russian food products and fertilizers to the world markets. He provided a detailed report on the progress already achieved in this regard and reiterated the United Nations' commitment to continue working to address remaining issues, said the readout.

Lavrov is at the UN headquarters in New York to chair Security Council meetings as his country holds the rotating Security Council presidency for the month of April.

Some stakeholders are "undertaking attempts to preserve the unipolar world order, by imposing the 'might is right' principle and trying to replace universal norms of international law with a 'rules-based order'," Lavrov was quoted as saying.

"We have reached a dangerous threshold," Lavrov noted, adding that "double standards need to be abandoned. Advancing the West's rules on the international arena is asphyxiating multilateralism. The key to success is concerted efforts."

The Russian mission to the United Nations pointed out that the United States denied the issuance of U.S. visas to Russian journalists who were supposed to accompany Lavrov on his official visit to New York for Security Council meetings.

This was done despite the fact that Russian media representatives complied with all relevant terms and requirements, including valid UN media accreditation, said the Russian mission in a statement on Sunday.

The United States violated again its obligations under the 1947 UN Headquarters Agreement, it said.

"We consider this step as another manifestation of neglect of international law by the United States. When denying access to UN events for Russian journalists, the U.S. authorities once again demonstrate their true attitude to freedom of speech and availability of information," read the statement.

(With input from Xinhua)