Any court may affirm, ratify and incorporate by reference in its decree dissolving a marriage or decree of divorce whether from the bond of matrimony or from bed and board, or by a separate decree prior to or subsequent to such decree, or in a decree entered in a suit for annulment or separate maintenance, and in a proceeding arising under subsection A 3 or L of § 16.1-241, any valid agreement between the parties, or provisions thereof, concerning the conditions of the maintenance of the parties, or either of them and the care, custody and maintenance of their minor children, or establishing or imposing any other condition or consideration, monetary or nonmonetary. Provisions in such agreements for the modification of child support shall be valid and enforceable. Unless otherwise provided for in such agreement or decree incorporating such agreement, such future modifications shall not require a subsequent court decree. This section shall be subject to the provisions of § 20-108. Where the court affirms, ratifies and incorporates by reference in its decree such agreement or provision thereof, it shall be deemed for all purposes to be a term of the decree, and enforceable in the same manner as any provision of such decree. The provisions of this section shall apply to any decree hereinbefore or hereinafter entered affirming, ratifying and incorporating an agreement as provided herein. Upon the death or remarriage of the spouse receiving support, spousal support shall terminate unless otherwise provided by stipulation or contract. In any case where jurisdiction is obtained over a nonresident defendant by order of publication or by acceptance of service pursuant to § 20-99.1:1, any properly acknowledged and otherwise valid agreement entered into between the parties may be affirmed, ratified and incorporated as provided in this section.