Russia is expressing concern about an alleged airstrike by Israeli warplanes inside Syria.
The Russian Foreign Ministry says such action, if confirmed, amounts to "uNPRovoked attacks" against a sovereign nation, in violation of the United Nations charter.
Differing accounts of the Wednesday airstrike have emerged, with Syrian authorities saying Israeli jets fired on a military research facility near Damascus, killing two people.
Israeli and Western news media reported an Israeli airstrike at a different location, close to the Syrian-Lebanese border. They say the target was a convoy delivering missile parts to Hezbollah, the strongly anti-Israel Shi'ite militia based in Lebanon.
Hezbollah condemned the attack in a statement Thursday and expresses its "full solidarity" with Syria.
The conflicting reports could not be resolved or independently confirmed by early Thursday and it remains unclear whether one or two separate strikes occurred. Israel routinely declines to acknowledge preemptive military actions and refused all comment Wednesday.
In recent weeks, Israeli officials have warned that they will not tolerate any transfer of Syrian weapons to militants such as Hezbollah.