I really would like an answer. Since I don't know anything about geopolitics, but how about this.

Ukraine becomes a buffer zone. It does not join NATO and NATO doesn't put any troops in Ukraine. It is allowed defensive weapons worked out in an agreement. Russia, Ukraine, and Belarus only put token forces near their borders also worked out in an agreement. NATO does not trust Russia for good reasons, but Russia also has good reason not to trust NATO. Does anyone have a better solution to avoid a war? I will add this, the Russian-Belarus border with Russia is over 1,600 miles. Russia will not stand for a 1,600-mile border with its enemy.