PART 1:
The United States cannot afford to not have troops in Europe. In fact, in light of Russia's actions in the previous 5 years, the United States at a minimum should double the number of troops it has in Europe. The United States does not defend Europe as an act of charity. It defends Europe because the survival of the United States is dependent on it. It is not true that the United States defeated ISIS in Syria without significant help from other NATO countries. Other NATO countries currently fly air missions over Syria and NATO troops, particular French troops have had presence in Syria on the ground in past years.
NATO won't commit troops on the ground in Syria or in the air absent of U.S. involvement. The United States is by far the most powerful military in NATO and has resources, particular in logistics that are key to sustaining any other NATO country's intervention there. So Trump's foolish decision to withdraw the 2,000 U.S. troops in Syria essentially prevents any NATO involvement.
Your statement about the Russian economy is
FALSE. When adjusting for purchasing power parity, the Russian economy is the 6th largest in the world.
1
China $23,210,000,000,000
2
United States $19,490,000,000,000
3
India $9,474,000,000,000
4
Japan $5,443,000,000,000
5
Germany $4,199,000,000,000
6
Russia $4,016,000,000,000
7
Indonesia $3,250,000,000,000
8
Brazil $3,248,000,000,000
9
United Kingdom $2,925,000,000,000
10
France $2,856,000,000,000
11
Mexico $2,463,000,000,000
12
Italy $2,317,000,000,000
13
Turkey $2,186,000,000,000
14
Korea, South $2,035,000,000,000
15
Spain $1,778,000,000,000
16
Saudi Arabia $1,775,000,000,000
17
Canada $1,774,000,000,000
18
Iran $1,640,000,000,000
19
Australia $1,248,000,000,000
20
Thailand $1,236,000,000,000
As you can see, Russia's economy is nearly twice the size of Italy's and nearly as large as Germany's economy. In any event, raw military capabilities matter far more than economic size has history has so often shown in the past.
PART 2/3: Erdogan is predictable based on his past years of experience and refusal to move Turkish troops into areas where U.S. troops are located. No other country in NATO would support Turkey foolishly attacking U.S. troops in Syria. Turkish troops would be thrown back with heavy losses and then face isolation and economic sanctions from the rest of Europe. Erdogan is not that dumb. Any Turkish operation against the Kurds with U.S. troops in place would FAIL, do heavy damage to the Turkish armed forces and extensive damage to the Turkish economy. In fact, such a move would probably bring about Erdogan removal from power through a coup afterwards.
PART 4: For nearly 3 years, Trump has kept to nearly all of the United States prior middle east commitments, which is good despite his isolationist statements during the campaign and after the campaign. TRUMP and Erdogan have already had the showdown and the Turks wisely blinked. If Trump had kept U.S. troops there, there would be no Turkish invasion of northeastern Syria.
Most of the Turkish military uses outdated equipment by U.S. standards. They do have some modern equipment in some areas, but not in large numbers. Their most modern Tank, the German LeopardIIA4 is not considered modern enough for them which is why they wanted Germany to upgrade the tank to LeopardIIA7 standards but Germany refused. Turkey has a modern economy and society, but that makes it vulnerable to U.S. attacks on water systems and electricity. When the United States turned off the water and electricity in Serbia during the 1999, Kosovo War, it generated popular resentment among Serbians against their own leaders which led to the conclusion of the conflict, and not to long later to Slobondon Milisovic being removed from power internally.
PART 5: Not true, Donald Trump green lighted the Syrian operation and agreed to pull out U.S. troops. If Erdogan did not care, he would have invaded north eastern Syria years ago.
PART 6: the NATO charter was invoked with respect to Afghanistan because New York City and Washington D.C. were attacked by forces within Afghanistan.
PART 7: There would not be any agreement by the Kurds with the Russians and Assad if Trump had kept the troops in place. The Kurds only turned to Assad and the Russians after Trump green lighted the Turkish invasion and pulled U.S. troops out.
PART 8: No evidence of this at all. No attacks by Turkey at all for years when U.S. troops were in place in north eastern Syria. Its not just the 2,000 U.S. troops on the ground in Syria, but also the Kurdish forces, U.S. airpower, plus what the United States could bring to the region rather quickly in terms of more Air Power and ground troops. There is also the weakness in the ability of the Turks to defend their country from U.S. Air and Missile attacks and well as cyber attacks on the country's water and electricity systems. Then there is the threat of a coup to unseat Erdogan from power.
PART 9: As Linsey Graham said today, Trump has let ISIS out of its prisons and if any American citizens are killed anywhere in the world by ISIS forces from Syria, it will be Trump's fault. ISIS is a group that is trying to launch a 9/11 scale attack on the United States mainland and Trump's actions in Syria over the past week just made that more likely. The United States with the Kurds and help of other NATO countries retook all of the Syrian territory that was controlled by ISIS. But ISIS was not totally destroyed yet. It now has a chance to make a comeback because of Trump's actions. This has put Americans lives far more at risk. Trump has in just one week, created a huge mess and serious threat to the United States by pulling out U.S. troops.