If we arm the Ukraine, how long is it until we have another missle crisis?

There won't be another missile crisis.

Neither the US nor Russia are stupid enough to launch nukes over Ukraine. The collateral and diplomatic damage far outweighs any gain from using these weapons.

Besides, modern weapons are far more effective at taking out military assets than nuclear bombs ever were.

Won't happen, Ukraine was a tool to raise Defense-Budgets, because for 1 of the first times in History, the Arms Industry projected a serious drop-off in growth/sales(not a loss yet, but that's because they're kind of like Oil, loss-proof).

Now that most Countries have agreed to raise their Defense-Budgets, the mission is accomplished, they got their money

If we don't support Ukraine how long is it before the next missile crisis with mighty Russia the 2nd greatest military power on earth. Ukraine doesn't even have missiles....Russia has plenty.

We won't arm the Ukraine.

Russia have already achieved their objective. They now have the Crimea and have secured their Naval base on the Black Sea.