America, the Indispensable Nation, is finding itself increasingly "dispensable".
This latest example is today's news from Syria.

The Syrian government and its most important ally, Russia, announced on Thursday a cease-fire agreement with Syrian rebels and with Turkey — a potential turning point in a civil war that has lasted nearly six years and claimed hundreds of thousands of lives.
It remained to be seen if the agreement would take effect or hold, and President Vladimir V. Putin of Russia twice called it “fragile.” Previous attempts to quell the fighting, brokered under the auspices of the United Nations, have failed.
But the rebels’ loss of their stronghold in eastern Aleppo this month was a major blow to their movement to oust President Bashar al-Assad, leaving them without footholds in Syria’s largest cities. That may have prodded them toward a compromise and given Russia a chance to consolidate Mr. Assad’s control through diplomacy.

Besides the fall of Aleppo, there is one other difference with this cease fire - the U.S. wasn't part of it.

The United States on Tuesday sought to downplay its absence from talks on the Syrian conflict among Russia, Iran and Turkey in Moscow, saying it was not a "snub" and did not reflect a decline of U.S. influence in the Middle East...
Dennis Ross, a fellow at the Washington Institute for Near East Policy who was an adviser on Iran and the Middle East to both Democratic and Republican administrations, said the United States had made itself "irrelevant" in Syria....
"We would obviously refute any notion that ... the fact that we weren't at this one meeting is somehow a harbinger or a litmus test for U.S. influence and leadership there or anywhere else around the world," Kirby said, adding that Washington was still engaged in the region on many other issues.
"We are not excluded, we are not being sidelined," he added.

Reality check: not being invited to peace talks in your own war (i.e. excluded) is a snub (i.e. sidelined).

Most pundits will say we were snubbed because of our half-hearted military commitment to the war in Syria didn't give us much leverage, and there is a grain of truth to that.

But the real reason we were snubbed is because Washington doesn't do diplomacy anymore.
"Diplomacy" in Washington today equal a drone strike. Or if that fails, sending in the Special Forces.
Everything is a nail to be hammered down.
Talking is a sign of weakness.

This "sign of weakness" is bleeding over to Afghanistan.

Ahmad Shekib Mostaghni, a spokesman for the Afghan Foreign Ministry, said Tuesday that his country had not been invited to a high-level Afghanistan conference in Moscow.
Representatives of Pakistan, China and Russia are meeting in Moscow to discuss the Afghan conflict but they have excluded Afghan officials from the conference.

One reason for excluding America and the Afghan government is because who is being armed by us.

So when the Afghan government last year approved Qul’s request to enrol in its anti-Taliban militia program, many local people were concerned. Hundreds protested outside the district government building. Contemporary western security reports obtained by the Guardian warned that reinforcing Qul’s militia could add to violence, crime and territorial rivalries....
In an interview, Perim Qul admitted that his chief enemy was not the Taliban, whom he was paid to fight. It was the local governing political party.
“We will fight alongside any group to get rid of the oppression of Jamiat,” he said, referring to the Tajik-majority party in the north, which he says discriminates against people of other ethnicities. “We don’t care if it’s Taliban or Isis. If anyone throws a stone at our enemy, we will fight with them.”