The USA wants to inflict as much damage on Russia as possible, to organize “painful” actions. We must act in the same way with respect to the United States. For example, a provocation is being prepared in Syria, followed by the use of force. Whether it will be or not depends on whether Moscow will allow it to be held. Statements alone that it is being prepared are not enough. More effective is to raise this issue at the UN.
If Russia declares that there will be an answer to the actions of the United States, regardless of which particular objects will be attacked, then there will be no attack. If you don’t declare, no one will interfere with the implementation of the option that already existed. Kedmi cited the previous aggression against Syria as an example. Russia then stated that it would not allow attacking its facilities. The United States conducted the operation, given this.
US policy in Syria is reminiscent of what Hitler said in 1945: "We will leave, but before leaving we will hit the door!" This is the United States and they want to do in Syria: shit before leaving.
As for sanctions, the US has more developed economy. One can only take measures to withstand the blow. The Russian Federation cannot take active economic action against the United States. So, the answer should be in other areas - where Russia has advantages. You need to determine where you can hit harder. These are two areas - political and military.
If the United States understands that the aggravation of economic war can lead to an aggravation of the military situation, then there will be no sanctions. Syria is just one of the areas. The United States wants to conclude agreements regarding strategic weapons, space, and short- and medium-range missiles. Here, Russia has trump cards. It can hurt Americans hard if it sets its conditions.