Russia has issued a chilling threat to the rest of the Western world - as officials in Moscow warned there would be a tough military response to any further attack on Russian territory.
They accused the United States and its key allies of undermining European security by openly inciting Ukraine to assault Russia.
Vladimir Putin's forces have been attacking Ukrainian cities since February 24 and have killed thousands of people and displaced millions more.
Russia has in recent days reported what it says are a series of attacks by Ukrainian forces on Russian regions which border Ukraine, and has warned that such attacks risk a significant escalation.
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Russian foreign ministry spokeswoman Maria Zakharova told reporters in Moscow: "In the West, they are openly calling on Kyiv to attack Russia including with the use of weapons received from NATO countries."
"I don't advise you to test our patience further."
Russia's defence ministry said earlier this week that if such attacks continued then Moscow would target decision-making centres in Ukraine, including those where it said Western advisers were helping Kyiv.
Ms Zakharova warned that the West should take the threat seriously and Russia would have a "tough response".
"Kyiv and West capitals should take the statement from the Ministry of Defence seriously that further inciting of Ukraine to strike Russian territory will definitely lead to a tough response from Russia," Ms Zakharova said.
The United States has ruled out sending its own or NATO forces to Ukraine, but Washington and its European allies have supplied weapons to Kyiv such as drones, Howitzer heavy artillery, anti-aircraft Stinger and anti-tank Javelin missiles.
Kremlin spokesman Dmitry Peskov also told reporters : "In itself, the tendency to pump weapons, including heavy weapons, to Ukraine and other countries are actions that threaten the security of the continent and provoke instability."
Total US security assistance since the invasion amounts to about $3.7 billion, a US official said.
Russian President Vladimir Putin casts such large arms shipments as part of a broader plan by the United States and its allies to destroy Russia - and has added that it will not succeed.
Putin says the "special military operation" in Ukraine is necessary, because the United States was using Ukraine to threaten Russia and Moscow had to defend against the persecution of Russian-speaking people.
