Russian Foreign Minister Sergey Lavrov "diverted" U.S. Secretary of State Antony Blinken's calls to reconsider the decision to suspend Russia's participation in the New START treaty, Russia's foreign ministry told Interfax, Russian news agency.

“If they want to return to diplomacy, let them return. If they are engaged in self-promotion and such inexpensive PR, well, this is possible. True, the result will be appropriate," Maria Zakharova, a spokesperson for the ministry, told Russian TV channel Rossiya-1.

-ABC News' Natalia Shumskaia

U.S. Secretary of State Antony Blinken and Russian Foreign Minister Sergey Lavrov had an "on the go" talk during the G-20 Meeting of Foreign Ministers in India, but there were no negotiations, Russian Foreign Ministry spokeswoman Maria Zakharova told TASS, a Russian news agency, Thursday.

"Blinken asked for a contact with Lavrov. Sergey Viktorovich [Lavrov] had communication on the go during the second session. But there were no negotiations, no meeting or so on," the diplomat said.

Blinken had said earlier in the day during a press conference he had "spoke briefly" with Lavrov and discussed ending the war, as well as Russia rejoining the New START Treaty on nuclear arms.

"I told the foreign minister what I and so many others said last week at the United Nations and what so many G-20 foreign ministers said today: End this war of aggression, engage in meaningful diplomacy that could produce a just and durable peace," he said. "The United States stands ready to support Ukraine through diplomacy to end the war on this basis."

A senior State Department official downplayed any hopes that the conversation moved the needle on any of the topics.

-ABC News' Tanya Stukalova and Shannon Crawford

Ukraine has shot down 80% of Russian missiles, according to Commander of the Joint Forces of the Ukrainian Air Force Serhiy Nayev.

Nayev made the assessment in a Facebook post on Wednesday about the effectiveness of the air defense system.

"The enemy is also changing his tactics and ways of using air strike means, so we test after every hit," he wrote. "This analysis proves that commanders, respectively, make decisions that ensure the durability of the air defense is at the highest level."

-ABC News' Ellie Kaufman

Colonel-General Oleksandr Syrsky, the commander of Ukraine's Eastern Group of Forces, will send additional units to Bahkmut, according to Ukraine's Deputy Defense Minister Hanna Malyar.

"Bakhmut has been the epicenter of hostilities for several months now. The enemy has concentrated its key efforts there because it aims to reach the borders of the Donetsk region. The situation there is really tense and difficult," Malyar said.

Ukrainian President Volodymyr Zelenskyy echoed that statement in his nightly address.

"The most difficult situation is still Bakhmut and the battles that are important for the defense of the city," he said.

-ABC News' Ellie Kaufman and Will Gretsky

U.S. Secretary of State Antony Blinken warned Friday that China is "actively thinking about" providing lethal assistance to Russian forces in war-torn Ukraine.

"We're very concerned that they're thinking about it. Up until now, Chinese companies have provided non-lethal support," Blinken told ABC News' George Stephanopoulos during an interview on "Good Morning America."

"From Day One, President Biden warned President Xi not to provide material lethal assistance to Russia for use against Ukraine or to engage in the systematic evasion of sanctions. And the information we have suggests that they’re now actively thinking about it, which is why we've been public about warning them not to," he added. "It could make a material difference in Russia's capacity on the ground at a time when we want to bring this war to an end, not add fuel to the fire and have it continue."

The U.S. government has "shared a lot of information with other countries, with allies and partners," regarding the fact that China is now considering lethal assistance, according to Blinken.

"We always have to get the balance right between making sure that we're protecting the way we get our information and releasing it," he said. "But we thought it was really important to make clear that China's looking at this. And what they're hearing not just from us but from many other countries around the world is: Don't do it."

The Chinese Ministry of Foreign Affairs released a position paper on Friday, calling for a ceasefire between Russia and Ukraine, the resumption of peace talks, an end to unilateral sanctions and the consideration of sovereignty, territorial integrity and security concerns of all countries. Blinken told ABC News that the U.S. government is "taking a look at it."

"No one wants peace more than the Ukrainians and any proposal that can advance peace is something that's worth looking at," he said. "But, you know, there are 12 points in the Chinese plan. If they were serious about the first one, sovereignty, then this war could end tomorrow."

"China's been trying to have it both ways," he added. "It's on the one hand trying to present itself publicly as neutral and seeking peace, while at the same time it is talking up Russia's false narrative about the war, it is, as I said, providing non-lethal assistance to its companies and now contemplating lethal assistance."