Speaking at a regular briefing on Thursday, Russian Foreign Ministry spokeswoman Maria Zakharova said that the United States has occupied the southern part of Syria.
"The situation in the northeast of Syria, where the US side is still trying to flirt with separatist-minded Kurdish groups, is concerning, as well as in the south of the country near Al-Tanf, where there is a de facto undisguised occupation by US forces of the territory of the sovereign Syrian state," she said.
Drone Attack on Hmeymim
Zakharova has also confirmed reports that the aerial attack on Russia's Hmeymim Air Base in Syria could have been controlled by a US spy plane.
“This information, provided by our military experts, is absolutely relaible. We have repeatedly voiced our concerns in this regard. And, certainly, during our contacts with American partners, including along the military and political line. Our concerns will once again be brought to their notice."
Her remarks come shortly after Russian Deputy Defense Minister Alexander Fomin said that unmanned aerial vehicles involved in an attack on the Hmeymim base were piloted by a US Poseidon 8 surveillance aircraft. He, however, didn't specify when exactly the assault took place.
INF Treaty
Addressing Washington's potential withdrawal from the 1987 Intermediate-Range Nuclear Forces Treaty (INF), Zakharova said that Russia was calling on all nations to send an "unambiguous" signal to the US to preserve the agreement.
READ MORE: US Decision to Withdraw From INF Shows Intention to Start Arms Race — Kremlin
The diplomat stressed that Russia's missile programs, including development of cruise missiles, were carried out in full compliance with the treaty, and while Moscow intends to continue work with the agreement, Washington is unwilling to act on equal basis.
"For several years, the American side has refused to provide any objective data supporting Washington's conclusions that the Russian 9M729 ground-based cruise missile that passed flight tests has the operating range banned by the treaty. We have repeatedly confirmed that the missile programs implemented by Russia fully meet our obligations under the INF Treaty," she underscored, adding that the development of the 9M729 cruise missile was "transparent to the maximum affordable degree.
"The American side was never able to present any evidence to either Russia or the international community to substantiate its claims. They remain unfounded and are provocative. And we reiterate that Russia strictly abides by the provisions of the treaty," she added.
READ MORE: Stoltenberg Says NATO Doesn't Want New Arms Race While Siding With Trump on INF
“Now we are forced to seriously warn Washington. If the American side undermines the treaty, Russia will have to react. We are ready to work on maintaining its [the INF] viability, but for this we need a partner who is responsible and interested in continuing the dialogue for the sake of world stability. A solution to the problem can only be found through a frank, equitable and, of course, constructive dialogue," she said.
Moscow has repeatedly rejected the claims and pointed to possible US violations of the treaty with its missile defense installations in Eastern Europe.