foreign Ministry of Chaina Spokes person Mao Ning hosted a regular press conference on the 27th. A foreign media reporter asked about Russia's announcement of the deployment of tactical nuclear weapons in Belarus. What's China's comment?

  Mao Ning said that in January last year, the leaders of the five nuclear-weapon states issued a joint statement, pointing out that a nuclear war cannot be won or fought, emphasizing that wars between nuclear-weapon states should be avoided and strategic risks should be reduced. Under the current circumstances, all parties should focus on diplomatic efforts to peacefully resolve the Ukrainian crisis and jointly promote the relaxation of the situation. 

Russia announced the deployment of tactical nuclear weapons in Belarus, China expressed its position

Russia to deploy tactical nuclear weapons in Belarus

CCTV News reported that On March 26, Russian President Vladimir Putin announced, based on a RIA Novosti report, that Russia and Belarus have agreed to place tactical nuclear weapons in Belarus at the request of Belarusian President Lukashenko. Russia will start training relevant personnel from April 3, and will complete the construction of storage facilities for tactical nuclear weapons in Belarus before July 1.
  Putin said that Russia has helped Belarus re-equip 10 fighter planes capable of carrying tactical nuclear weapons, and Russia has also transferred a certain number of Iskander missile systems capable of carrying tactical nuclear warheads to Belarus. But he did not say when the tactical nuclear weapons would be deployed in Belarus.
  Putin emphasized that the above decision does not mean that Russia will hand over nuclear weapons to Belarus. He said that the United States has been deploying tactical nuclear weapons on the territory of its allies for decades. Russia is doing the same thing as the United States and does not violate its commitment to non-proliferation of nuclear weapons.

The Ukrainian Ministry of Foreign Affairs issued an appeal

According to World Wide Web citing the Associated Press, the British "Guardian" and other media reports, the Ukrainian Ministry of Foreign Affairs issued a statement on Sunday (26th) local time to condemn Russia's previous announcement that it would deploy tactical nuclear weapons in Belarus, and called on the UN Security Council to take action on this matter. Call an emergency meeting.
  In a statement issued by Ukraine's Ministry of Foreign Affairs, it expressed its hope that the UN Security Council would take appropriate and effective measures to address the nuclear coercion exerted by the Kremlin.

Pentagon and White House respond quickly

According to a TASS(Russian News Agency) report on March 26, the US Pentagon’s news department issued a statement on the matter on the 25th local time, saying that the US government has no intelligence indicating any intention by Russia to employ nuclear weapons, and therefore, there is no justification for altering the current deployment of US nuclear forces.
  According to reports, the White House also issued a similar written statement saying, "We have seen reports about the Russian announcement and will continue to pay attention to it. At present, we do not see any reason for us to adjust our strategic nuclear posture. There is also no indication that Russia is preparing to use nuclear weapons. We remain committed to (maintaining, strengthening) NATO's 'collective defense'".